Last updated May 26, 2026

Free Orcus Calculator

Enter your birth details to find (90482) Orcus: the part of the chart that records the private oath, the inner pact you swore yourself to apart from the world's contracts, and the long solo work done out of sight where the integrity is its own reward.

What Orcus is, and what this calculator returns

Orcus (90482) is a Plutino dwarf-planet candidate in 2:3 mean-motion resonance with Neptune, with a roughly 246.6-year orbit, a perihelion near 30.6 AU, an aphelion near 48.1 AU, and an inclination of about 20.6 degrees off the ecliptic. He was discovered on February 17, 2004 by Mike Brown, Chad Trujillo, and David Rabinowitz at Palomar Observatory and was given provisional designation 2004 DW before being formally numbered (90482) Orcus later the same year and named for the Roman and Etruscan god of the underworld. Three pieces of his astronomy do specific work for the astrological reading. The first is the resonance with Neptune: Orcus is a Plutino, the same orbital family as Pluto, which means he shares the long-period gravitational lock to Neptune that gives Pluto its multi-decade rhythm. The second is the orientation of the orbit: Orcus's orbital geometry is roughly the mirror image of Pluto's, with the two bodies reaching perihelion at opposite phases of their shared resonance. This is the basis of the informal 'anti-Pluto' label Mike Brown used in the original papers, and it grounds the astrological reading: where Pluto names the collective underworld, Orcus names the private one. The third is the moon Vanth, discovered in 2005, unusually large at roughly one-third Orcus's diameter, named for the Etruscan winged psychopomp who guides souls into the afterlife.

Orcus is one of the nine outer dwarf planets and TNOs this site supports. For the side-by-side outer-body family read use the dwarf planet astrology calculator linked below; the Pluto out-of-bounds dates page reads the anti-Pluto pairing alongside.

The calculator above returns your Orcus sign, degree, house, current retrograde state, and any tight major aspects to your personal points. Positions come from a JPL SBDB Keplerian element set at epoch JD 2461000.5 (2025-Nov-21 TDB) propagated through the DE441 ephemeris by the same engine that drives the rest of Augurine's transit and timing work. The twelve sign and twelve house entries that follow give written interpretations placement by placement; the calculator points you to the ones that match your chart.

The myth: the underworld god who heard the oath

Orcus was, in earliest Roman religion, the chthonic god of the underworld, a doublet of Pluto and Dis Pater whose particular function was the enforcement of the sworn oath. The name carries the etymology directly: Orcus is cognate with the Greek 'horkos', literally 'the sworn oath itself', personified in Greek mythology as a daimon born of Eris (strife) whose work was to punish perjurers. In Roman folk religion Orcus was the deity to whom the most binding promises were sworn, the one who heard the vow at the moment it was made and who held the perjurer accountable in the underworld when the promise was broken. The Etruscans inherited the figure and depicted him in tomb paintings as a bearded chthonic ruler attended by Vanth, the female winged psychopomp who carried souls into the afterlife where the weighing happened.

The chart-level translation is precise. Orcus is the part of the chart that carries the private oath, the inner pact you swore yourself to apart from any of the public contracts the world also holds you to. The placement asks two related questions: what is the deep commitment you have made to yourself that nobody else necessarily knows about, and what is the underworld practice you have committed to carry across the decades it requires. The shadow is the oath that has quietly stopped being kept, the inner contract the native is no longer practicing but is also unwilling to formally renounce. The Orcus reckoning is what happens when the gap between the surface life and the unkept underground vow grows large enough that the body or the relationships or the work begin to feel the difference.

How to read your Orcus placement

Your Orcus sign is generational. Orcus moves slowly (about 246.6 years to complete a single orbit and roughly 20 to 45 years to cross a single sign depending on where it is in its eccentric path) so almost everyone alive shares the sign with a wide cohort of contemporaries. The piece that varies meaningfully between birth charts is the house. Read the house first.

Aspects to personal planets are where the cohort claim becomes a private appointment. Orbs run tight: 1.5 degrees for major aspects with personal points, 0.75 for minor work. Wider than that, the body is generational background rather than foreground. Orcus in tight aspect to your Sun, Moon, Ascendant, Venus, or Mars rewrites the corresponding chart factor with the oath-keeper signature, naming a particular life function as the carrier of the long private vow. Aspects to the slow movers (Pluto, Uranus, Neptune) are cohort texture rather than personal reading, but Orcus in tight conjunction or opposition to natal Pluto is the diagnostic 'anti-Pluto' contact and reads the entire Plutonian function through the private-oath register rather than through the collective-transformation register.

Retrograde at birth turns the oath-keeper inward in a doubled way. The vow gets practiced even more privately than usual, often without the native being able to articulate what the commitment is until decades into carrying it. The available path is to let the long underground practice mature on its own timeline and then trust the integrity of the work without requiring an outside witness to confirm what has been carried.

Orcus and the anti-Pluto relationship

The 'anti-Pluto' framing is unusually load-bearing for Orcus interpretation, and it does specific work that no other outer body provides. Both Orcus and Pluto are Plutinos: they sit inside the 2:3 mean-motion resonance with Neptune, locked into Neptune's gravity at a rhythm that ensures the two bodies never approach each other closely despite the apparent overlap of their orbits when viewed in cross-section. They have similar sizes (~900 to 1200 km diameter for both), similar orbital periods (Orcus ~246.6 years, Pluto ~248), similar eccentricities (Orcus ~0.222, Pluto ~0.248), and similar inclinations (Orcus ~20.6 degrees, Pluto ~17.1). What makes Orcus the mirror image rather than just a smaller copy of Pluto is the orientation of the orbit. The two orbital planes are rotated relative to each other in such a way that when Pluto reaches perihelion (closest to the Sun, currently around the late 1980s for Pluto), Orcus is near aphelion, and vice versa. The pair perform the same Plutino dance but in opposite phase.

The astrological consequence is clean. Pluto names the part of the underworld function that operates at collective scale: the taboo the whole culture has agreed to bury, the mass psychology of an era, the generational transformation that arrives whether or not any individual signs up for it. Orcus names the part of the same underworld function that operates at personal scale: the private oath the individual has sworn, the inner pact carried over decades regardless of whether the wider culture supports or even knows about the commitment, the long solo practice that does not require collective participation to remain valid. Reading Pluto and Orcus together gives you a complete underworld picture: the public weather the generation is moving through (Pluto) and the private vow the individual is carrying inside that weather (Orcus). A tight Orcus-Pluto contact in a natal chart is the diagnostic signal that the native's relationship to the collective underworld is mediated specifically through the private-vow register.

Orcus in aspect to your personal planets

Orcus conjunct, square, or opposite the natal Sun (within 1.5 degrees) wires identity to the oath-keeper signal. The native often carries a long private commitment that other people do not initially see but eventually verify by the consistency of the long arc, and the body of work they are recognized for tends to be the visible expression of an inner vow that was sworn decades earlier. The shadow is the Sun whose identity has been organized around a private oath the native is no longer actually keeping but is also not willing to renounce, producing a peculiar tension between the visible self and the unkept underground commitment.

Orcus on the Moon makes the oath-keeper function a felt, body-and-emotion experience. The native often comes from a household where someone carried a long unspoken vow (the parent who sustained the family through a multi-decade fidelity to a difficult commitment, the grandparent whose silent loyalty held the line together across generations) and inherits the somatic memory of being inside a kept oath. The work is naming the inherited vow consciously and choosing whether to renew, amend, or formally release it.

Orcus on the Ascendant means people read the oath-keeper signal in your physical presence, often as a particular kind of unperformed gravity that other people interpret as integrity even before they know what the integrity is committed to. Orcus on the Descendant puts the function in the partner seat: see the 7th-house entry below. Orcus aspects to Venus rewrite the love-and-pleasure narrative around long fidelity; the native tends to be drawn to people who themselves carry an unspoken inner pact, or to relationships whose value reveals itself only across decades. Orcus on Mars is the recurring pressure to sustain the long solo discipline regardless of whether the action is being witnessed; at best, the unflinching multi-decade practitioner whose body of work is verified by its consistency; at worst, the native whose inner vow has hardened into a refusal to accept any input from the outside about how the work should evolve.

Orcus in tight conjunction or opposition to natal Pluto is the most distinctive contact and reads the entire Plutonian function specifically through the private-oath register. The cohort with this aspect is small (it requires the two bodies to be in close relationship at birth, which happens only during specific multi-year windows) and the natives tend to be people whose relationship to collective transformation is mediated through a personal commitment they would honor even if the wider culture moved on.

Orcus retrograde

Orcus is retrograde for roughly half of each year as Earth's faster orbital motion laps it, and the retrograde stations move by less than a degree per year, so generations share the retrograde-direct status of natal Orcus in tight clusters. Natal Orcus retrograde is common, and the reading is that the inner vow goes underground inside the underground: the oath is even more interior than usual.

Natal Orcus retrograde turns the oath-keeper inward in a doubled way. The vow gets practiced privately, often without the native being able to articulate what the commitment is until decades into carrying it. The native may have an unmistakable sense of being held to a long inner standard without being able to name the standard explicitly, and the work the vow organizes is often only legible to the native in retrospect, sometimes only at the end of the life. The risk is unconscious compliance: the native is being run by an inherited or undiscovered oath whose terms have never been examined and may not actually fit the life. The available path is to let the long underground practice mature on its own timeline and to do the slow work of bringing the implicit vow into explicit awareness, even if the explicit naming takes years.

Transiting Orcus retrograde is a roughly annual invitation to revisit the inner pact currently in progress. Whatever long commitment surfaced during the prior direct station gets a second pass: is the vow still alive, has the underground practice continued, has the integrity actually been carried or has the native been running on the residue of a vow that has quietly stopped being practiced. The retrograde is for review of the long-arc commitment, not for starting new ones.

The orbital mirror, the large moon, and the chart-level pattern

Three pieces of Orcus's astronomy do the heavy lifting for the astrological signature. The first is the Plutino resonance with Neptune: Orcus is locked into the same 2:3 gravitational rhythm as Pluto, which means his motion is structured by the same long Neptunian time-signature the entire Plutino class shares. This grounds the reading in slow time. Orcus is not a body whose passage gets read in months or years; the relevant unit is the decade and the lifetime. The second is the orbital orientation. Orcus's orbit is rotated relative to Pluto's so that the two bodies reach perihelion at opposite phases of the shared resonance, and the astrological consequence is that the two bodies divide the underworld function between collective (Pluto) and private (Orcus) registers. The third is the moon Vanth: unusually large at roughly one-third Orcus's diameter (making the pair almost a binary system), named for the Etruscan winged psychopomp who guides souls into the afterlife. The pairing reads as integrated: Orcus carries the oath, and Vanth is the companioned passage the native often needs in order to actually do the long underground work. A chart with strong Orcus often also names the Vanth-figure, the trusted other who walks with the native into the territory where the keeping of the vow happens.

Practically, the placement reads strongest in three contexts: tight aspects to personal planets (especially Sun, Moon, Ascendant, and natal Pluto), placement in the 4th, 8th, or 12th houses (the underworld houses by classical attribution), and placement at angles or in stelliums where the underground signal cannot be ignored. Without those amplifiers, Orcus tends to read as generational texture: the cohort carries the sign-level oath, but the personal life is organized primarily by the other chart factors, with Orcus quietly underneath rather than as the primary driver.

Orcus versus Pluto, Sedna, Eris, Haumea, Makemake, and Quaoar

Orcus sits inside the wider cluster of slow-moving outer bodies that touch the question of how a generation engages depth, but each one names a distinct function and the cleanest chart work tells them apart rather than collapsing them into a single outer-body texture.

Pluto names the collective transformation, the mass psychology of an era, and the taboos the whole culture has agreed to bury. The signature is the generational underworld the whole cohort moves through.

Sedna is the betrayal by the guardian-figure who was supposed to protect, the long descent into the cold, and the transformation of the cast-out into the body the next generation feeds from. The signature is the guardian's failure and the survivor becoming provision.

Eris is the disruptor who names the rigged arrangement the wider system has agreed not to see. The signature is the inconvenient truth named at the wedding.

Haumea is the regenerative ground itself, the body that broke apart and whose fragments became the family the next generation lives inside. The signature is the productive rupture and the collision that became a coherent family.

Makemake is the cyclic provider whose authority has to be re-earned by a recurring climb, the steward whose office is borrowed for a season and renewed by ritual.

Quaoar is the founding choreographer whose dance sings the supporting deities of a world into being so the next generation can live inside the framework the founder set.

Orcus is none of these. Orcus is the private oath, the inner pact you swore yourself to apart from any of the public contracts, and the long underground work done across decades without an audience. Where Pluto operates at the scale of mass culture and Sedna names the betrayal of the guardian's role, Orcus operates at the scale of a single life carrying a single vow over the decades it was sworn for. If your chart story is closer to one of the other bodies, read that one first; this page is for the readers whose story matches the Orcus signature precisely.

Orcus through the 12 zodiac signs

A short interpretation of Orcus in each zodiac sign. Read the entry that matches your placement above. The other entries give you the texture and shape of the archetype across the full wheel.

Orcus in Aries

the oath sworn alone at the starting line

Orcus in Aries swears the private vow at the moment of beginning. You make the promise to yourself before anyone else hears about it, then walk into a multi-decade work without needing witnesses or applause. It works when the beginning is genuinely sustained: the inner pledge holding through years of unglamorous middle, the integrity of the long discipline checked against the original wording. The shadow is the chronic oath-taker: dramatic vows announced at every starting line, each abandoned long before the quiet middle that would have tested them. Begin in private, and keep beginning.

Orcus in Taurus

the vow kept by the body across decades

Orcus in Taurus binds the private oath to the body and the slow material practice. The vow gets carried through the long manual work: the farmstead worked across generations, the craft mastered in a single workshop, the body trained to a standard the public never asked for. It works when the discipline shows in the finished material whether or not anyone outside knows what the work cost. The shadow is attachment to a specific form: the practice frozen around the cherished object, unable to evolve when conditions change. Dismantle one beloved expression to keep the underlying vow alive.

Orcus in Gemini

the private pledge nobody hears you make

Orcus in Gemini holds the private oath inside language. The journal entry no one reads, the unpublished correspondence carried for years, the precise inner formulation of what you promised yourself when no one was listening. It works when the language stays consistent enough that the oath can still be checked against the original wording years later. The shadow is the elegant sentence mistaken for the kept commitment: a wording so polished it becomes a relic, defended for its phrasing while the underlying action quietly stops happening. Let the language evolve while the substance is preserved.

Orcus in Cancer

the silent contract with the ancestral line

Orcus in Cancer lays the private oath across the ancestral line. The silent vow to the parent who died before you were grown, the unspoken pledge to break or continue the family pattern, the quiet contract with ancestors who could not speak for themselves. It works when the multi-generational vow is conscious: you can name what was sworn and to whom, and stay in right relationship to the line without becoming its captive. The shadow is the inherited oath running as compulsion: a family pact whose original terms have been lost, the next generation inheriting a contract no one can renegotiate because no one remembers signing it.

Orcus in Leo

the inner sovereign that refuses to perform

Orcus in Leo holds the private oath as the part of the self that refuses to be performed. You carry a sovereign inner standard across decades without converting it into a public identity, and the people closest to you can feel the integrity of the long solo practice without ever hearing it announced. It works when ordinary visibility coexists with private sovereignty. The shadow is refusal-as-pose: the ostentatious withholding read by every audience, the inner sovereignty performed as a particular kind of unreachability. Be ordinary in public while continuing the sovereign practice in private.

Orcus in Virgo

the discipline practiced where no one is watching

Orcus in Virgo places the private oath inside the daily discipline practiced where nobody is looking. The unwitnessed routine: the morning sit, the long sobriety, the multi-decade therapy, the running practice no one is logging, the technical mastery built across thirty years in a basement workshop. It works when the discipline is the oath itself, the practice checked against itself rather than against any audience. The shadow is scrupulosity: the form of the practice policed so tightly that the original vow it was meant to keep gets lost. Skip the routine on an ordinary day and notice the oath itself is still intact.

Orcus in Libra

the integrity of the agreement when the witnesses are gone

Orcus in Libra holds the private oath inside the agreement no one is enforcing. The partnership commitment honored decades after the original vow, the professional confidence kept when the original holder is no longer present to check, the long collaboration sustained across years of inconvenience. It works when you can be trusted with the unenforceable agreement, when the contract holds in rooms where no third-party verification exists. The shadow is keeping a contract that should have been renegotiated: durability hardened into rigidity, the kept letter mistaken for the kept spirit. Open the contract for explicit renegotiation rather than silently bending it.

Orcus in Scorpio

the descent that keeps the buried promise

Orcus in Scorpio routes the private oath through the long descent. The multi-decade work of bringing concealed material back into view: the ancestral trauma processed across thirty years, the institutional record kept by a sole archivist, the buried family contract finally surfaced and renegotiated. It works when the descent is the substance of the vow, sustained in solitude across the years it requires, with periodic returns to the surface carrying what was found. The shadow is the descent become permanent residence: an underworld preferred over the world above, with the buried material never quite making its way back up to where it could be acted on.

Orcus in Sagittarius

the creed held to past the era of its plausibility

Orcus in Sagittarius holds the private oath to a creed past the era of its plausibility. The long fidelity to a cosmology, a faith, an intellectual lineage, a political philosophy whose public moment has passed and whose continued practice now happens largely in private. It works when the fidelity stays alive rather than nostalgic: a living relationship to the source that gets transmitted forward when the next plausibility window opens. The shadow is captivity to a finished doctrine: the cosmology held intact past the experience that originally confirmed it, the creed no longer mapping onto what you have actually lived.

Orcus in Capricorn

the durable form of the kept vow

Orcus in Capricorn binds the private oath to the durable form that outlives the swearer. The lineage school, the long-running trust, the chartered organization that exists specifically to keep one promise across generations. It works when the structure is the carrier of the vow, supple enough to hold the underlying commitment as conditions change. The shadow is confusing the durability of the structure with the integrity of the vow: the form defended past the point where it still serves the original promise, the institutional shell preserved while the substance inside has quietly stopped happening.

Orcus in Aquarius

the lonely covenant with the long-future cohort

Orcus in Aquarius makes the private oath to people you will not live to see. The climate-era practitioner whose work matters in the next century, the seed bank kept by a single curator, the open-source maintainer preserving the codebase for unborn collaborators. It works when you sustain the work without the satisfaction of seeing it land, the integrity checked against imagined inheritors rather than any present audience. The shadow is the long-future framing used to escape present accountability: a prophet of an inheritance not actually being built, the unborn invoked to dodge the living people whose claims are immediate.

Orcus in Pisces

the oath dissolved back into the silence it came from

Orcus in Pisces dissolves the private oath back into the silence it came from. The silent meditation lineage held for decades, the apophatic practice carried without a doctrine to defend, the anonymous service that leaves no record, the artistic work made and unmade without a permanent form. It works when dissolved authorship is the actual delivery and the world feels the practice without naming it. The shadow is dissolution-as-excuse: the mystical-sounding refusal to swear any concrete vow, the depth performed as a way of declining to commit. Commit to one specific unglamorous practice and sustain it for years.

Orcus through the 12 houses

If you have an exact birth time, your Orcus also lands in a specific house, the life area where this prompt may be easiest to notice. Without a birth time, use the sign placement as the steadier read and skip this section.

Orcus in the 1st house

Orcus in the 1st places the private oath on the body itself. People meet you and feel that something has been promised in private: a self that walks into the room carrying an undeclared discipline, a presence that does not quite explain itself. It works when the visible body actually carries the unwitnessed practice, when what others sense in you is real. The shadow is the unreadable surface that turned out to be hiding nothing: a withholding that became a style, the self-presentation of integrity used in place of the integrity itself.

Orcus in the 2nd house

Orcus in the 2nd places the private oath inside resources and personal values. How you spend, what you keep, what you refuse to monetize, the income arrangements you have made with yourself that nobody else gets to see. It works when the relationship to money and possessions reflects a multi-decade inner agreement about what wealth is for. The shadow is the value system used as private leverage: a hidden financial ethic that lets you defect from public agreements while telling yourself the private rule was always more important than the visible one.

Orcus in the 3rd house

Orcus in the 3rd places the private oath inside language. The journal carried since adolescence, the unpublished correspondence with a sibling, the inner monologue that holds the precise wording of what you promised yourself decades ago. It works when the private language stays consistent and the inner record can be checked against the original entries. The shadow is the wording polished into a relic: a beautiful phrasing defended for its elegance while the action it was meant to commit you to quietly recedes from your actual life.

Orcus in the 4th house

Orcus in the 4th places the private oath inside the ancestral household. The silent pledge to the parent who died, the unspoken vow to continue or break a family pattern, the contract with ancestors whose terms were never written. It works when the multi-generational vow is conscious, named, in right relationship to the line. The shadow is the inherited oath running as compulsion: the family pact whose original terms are lost, the household structured around a vow nobody alive can quite remember signing but everyone is still being bound by.

Orcus in the 5th house

Orcus in the 5th places the private oath inside creativity, romance, and the raising of children. The pledge made to your own creative practice when no one was watching, the long fidelity to a partner whose worth is not legible from outside, the multi-decade work of raising a child according to a standard you set with yourself. It works when the private commitment shows in the work, the relationship, the child. The shadow is the secret artistic standard used to dismiss everything publicly produced: a perfectionism kept private precisely so it never has to be tested.

Orcus in the 6th house

Orcus in the 6th places the private oath inside daily work and the body. The unwitnessed practice: the morning routine kept for decades, the long sobriety, the daily fitness or meditation discipline, the technical standard maintained at work even when the wider culture has stopped expecting it. It works when the daily practice is the oath itself. The shadow is the scrupulous routine that has eaten the underlying purpose: a perimeter defended for its own sake, the practice maintained so tightly that the original vow it was meant to keep has been forgotten.

Orcus in the 7th house

Orcus in the 7th places the private oath inside committed partnership. The vow held to long after the original commitment was made, the loyalty sustained through years of conditions that nobody promised would persist. It works when the unenforceable parts of the partnership are honored: the loyalty no contract could compel, the integrity that exists between the two of you and no one else. The shadow is durability hardened into rigidity: a partnership maintained out of fidelity to the original wording while the lived experience has stopped matching the vow. Renegotiate explicitly rather than silently bend the terms.

Orcus in the 8th house

Orcus in the 8th routes the private oath through the shared underworld. The pact made in pooled resources, the multi-decade discipline of carrying inherited material that nobody else volunteered to hold, the secret kept on behalf of someone who never knew you kept it. It works when the depth-work is sustained as the substance of the vow itself, with the surface periodically receiving what the descent has produced. The shadow is the underworld kept as private residence: a depth preferred to the world above, the buried material never quite resurfacing for the living to use.

Orcus in the 9th house

Orcus in the 9th places the private oath inside meaning and teaching. The fidelity to a cosmology, a teacher, a tradition whose public moment has passed but whose practice you continue alone. It works when the relationship to the source stays alive rather than ossified, with the practice transmitted forward when the next plausibility window opens. The shadow is the doctrine held intact past the experience that confirmed it: a creed defended in private long after your actual life stopped matching it, the philosophy preserved as artifact rather than lived.

Orcus in the 10th house

Orcus in the 10th places the private oath behind the public role. The office, the title, the visible career carries a commitment most witnesses cannot see: an integrity that exists between you and the work, independent of how others read your performance of it. It works when the visible role is being held to a standard nobody else is enforcing. The shadow is the public title that became the substitute for the private discipline: a career running on reputation while the original commitment that earned the reputation has quietly stopped being practiced.

Orcus in the 11th house

Orcus in the 11th makes the private oath to community and to people you will not live to see. The covenant with the future generation, the multi-decade commitment to a network whose payoff arrives long after you do, the unborn kin whose claims you carry. It works when you sustain the work without seeing it land, integrity checked against imagined inheritors rather than the current audience. The shadow is the long-future framing used to dodge present accountability: the unborn invoked precisely to avoid the living people whose claims on you are immediate.

Orcus in the 12th house

Orcus in the 12th dissolves the private oath into the unsaid. The contemplative practice carried without a doctrine to defend, the anonymous service that leaves no record, the artwork made and unmade across years without a permanent form. It works when dissolved authorship is the actual delivery, when the world feels the practice without your name being attached. The shadow is the dissolution used as cover for never quite committing: a mystical-sounding refusal to swear any concrete vow, depth performed as a way of declining to make any specific promise testable.

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Frequently Asked Questions

What is Orcus in astrology?

Orcus is a Plutino dwarf-planet candidate discovered in 2004 and named for the Roman and Etruscan god of the underworld, a doublet of Pluto and Dis Pater who was specifically the chthonic enforcer of the sworn oath and the punisher of mortal perjurers. The name shares an etymological root with the Greek 'horkos', the sworn oath itself. Astrologically, Orcus reads as the part of your chart that carries the private inner pact, the oath you swore yourself to apart from any public contract, and the long solo work done out of sight where the integrity is its own reward. The sign is generational. The house tells you the territory of the inner vow, and aspects to personal planets tell you how loudly the underworld signal reads at the personal scale. Where Pluto names what the wider culture has agreed to bury, Orcus names what the individual has sworn to keep across decades regardless of whether the world is watching.

How do I find my Orcus sign and house?

Enter your birth date, time, and place above. The calculator returns Orcus's sign, degree, house, current retrograde state, and any tight aspects the engine finds to the main chart factors. Positions come from a JPL SBDB Keplerian element set at epoch JD 2461000.5 (2025-Nov-21 TDB) propagated through the DE441 ephemeris, the same source the rest of the Augurine engine uses for transits and timing. The sign is a generational claim because Orcus moves slowly; the house and aspects are where the personal reading sharpens. The interpretation entries below give the written reading once your placement is on screen.

Why is Orcus called the anti-Pluto?

Orcus and Pluto share an unusually parallel astronomy. Both are Plutinos in 2:3 mean-motion resonance with Neptune, both have similar orbital periods (Orcus ~246.6 years, Pluto ~248), similar eccentricities (Orcus ~0.222, Pluto ~0.248), and similar inclinations (Orcus ~20.6 degrees, Pluto ~17.1). The two bodies are also similar in size (both roughly 900 to 1200 km in diameter) and both have a single unusually large moon. The difference is the orientation. Orcus's orbit is rotated relative to Pluto's so that the two bodies reach perihelion at opposite phases of their shared resonance: when Pluto is closest to the Sun, Orcus is near aphelion, and vice versa. Mike Brown, who co-discovered both Eris and Orcus, used the 'anti-Pluto' framing in the original 2004 papers because the orbital geometry is genuinely the mirror image of Pluto's. The astrology absorbs the mirror: Pluto names the collective taboo the whole culture has agreed to bury, Orcus names the private oath the individual has sworn to keep, and the two together form a single underworld function divided across the public and the private register.

What does Orcus retrograde mean in a natal chart?

Orcus is retrograde for roughly half of each year as Earth's faster motion laps it, and the retrograde stations move only fractionally per year, so generations share the retrograde-direct status of natal Orcus in tight clusters. Natal Orcus retrograde turns the oath-keeper inward in a doubled way: the inner vow gets practiced even more privately than usual, often without the native being able to articulate what the commitment is until decades into carrying it. The available path is to let the long underground practice mature on its own timeline and then trust the integrity of the work without requiring an outside witness to confirm what has been carried. Direct natal Orcus is more readily able to name the oath; retrograde Orcus carries it as felt obligation that the native may only consciously recognize after the fact.

How is Orcus different from Pluto, Sedna, Eris, and the other outer bodies?

All of the slow outer bodies touch the question of how a generation engages depth, but each names a distinct function and the cleanest chart work tells them apart. Pluto names the collective transformation, the mass psychology, and the taboos the whole culture has agreed to bury. Sedna is the betrayal by the guardian and the survivor's body becoming provision after the cast-out. Eris is the disruptor who names the rigged arrangement the wider system has agreed not to see. Haumea is the regenerative ground itself, the body that broke apart and whose fragments became the family the next generation lives inside. Makemake is the cyclic provider whose authority has to be re-earned through a recurring climb. Quaoar is the founding choreographer whose dance sings the supporting structure of a world into being. Orcus is none of these. Orcus is the private oath, the inner pact you swore yourself to apart from any of the public contracts, and the long underground work done across decades without an audience. Where Pluto operates at the scale of mass culture, Orcus operates at the scale of a single life carrying a single vow.

Why does the Roman oath-god mythology matter for the astrology?

In Roman and Etruscan religion, Orcus was not a generic underworld figure. He was specifically the chthonic enforcer of the sworn oath, the deity who heard what was promised to him in private and who exacted the underworld penalty when the promise was broken. The Greek cognate 'horkos' literally means 'the sworn oath' and was personified as a daimon born of Eris (strife) whose function was to punish perjurers. The mythology is unusually precise. Where most underworld figures are about death generally, Orcus is about the specific integrity of the spoken vow over time. The astrology absorbs the precision: Orcus names the part of the chart that carries the oath, the part that knows whether the inner pact has been kept across the decades it was sworn for, and the part that delivers the underworld reckoning when the vow has been broken. The reading is not about death or shadow in general. It is about whether the integrity of the long private commitment is still intact.

What does Orcus's moon Vanth tell us about the astrology?

Orcus's only known moon, Vanth, was discovered in 2005 and is unusually large at roughly one-third Orcus's diameter, making the pair almost a binary system rather than a primary with a satellite. Vanth is named for the Etruscan winged psychopomp, the female underworld figure who guides souls into the afterlife and who is depicted in Etruscan tomb paintings holding a torch to light the path of the dead. The naming is precise: where Orcus is the keeper of the oath, Vanth is the guide who accompanies the soul into the underworld where the oath gets weighed. The astrology reads the pairing as integrated. Orcus is the long inner vow, and Vanth is the part of the work that has to be done in companioned passage rather than in pure isolation: the trusted other who walks with the native into the underworld reckoning, often a single confidant or a single long therapeutic relationship across the decades the oath is being kept. A chart with strong Orcus contacts almost always also names the Vanth-figure, the person whose role is to accompany the keeper of the vow into the territory where the keeping happens.

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