Free Sedna Calculator
Enter your birth details to find (90377) Sedna: the chart's record of betrayal by the guardian, the long descent, and the transformation of the cast-out into the body the next generation feeds from.
What Sedna is, and what this calculator returns
Sedna (90377) is an inner Oort cloud object, an enormously distant member of the sednoid class, with a roughly 12,886-year orbit that carries her from perihelion at about 76 AU out to aphelion near 1,022 AU. Her orbital inclination is moderate (about 11.9 degrees) and her eccentricity is extreme (about 0.86). She was discovered on November 14, 2003 by Mike Brown, Chad Trujillo, and David Rabinowitz at Palomar Observatory, the same team that later discovered Eris and Haumea. The IAU named her Sedna at the discoverers' request after the Inuit goddess of the sea, the sovereign of the deep ocean whose body became the whales and seals her people hunt to survive. The astronomical record is unusually deep; her perihelion passage is due around 2076, the closest she will come to the inner solar system for the next 11,000 years.
The calculator above returns your Sedna 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), the same source the rest of the Augurine engine uses for transits and timing. 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: betrayal, descent, and the body that became provision
The story is older than the astronomy. The Inuit tell the myth in many versions, but the spine is consistent. Sedna is a young woman who refuses to marry, and eventually a stranger arrives who is not what he seems; she ends up trapped with him on his island. Her father comes to rescue her in the kayak. The stranger raises a storm. Her father, terrified the boat will go down, throws Sedna overboard. She clings to the boat's edge. He cuts off her fingers. The first joints become the seals. The second joints become the small whales. The third joints become the larger whales and the walrus. Sedna sinks to the deep and becomes the goddess of the sea, sovereign of the marine animals and the souls of the dead. The hunters must come to her with care, comb her hair (she has no fingers to do it herself), and ask before she releases the seals.
The chart-level translation is precise. Sedna is the part of you that survived betrayal by the guardian who was supposed to protect you, the part that went to the depths because the boat above could not be made safe, and the part that came back transformed into something the next generation feeds from. The placement asks two related questions: what did your descent produce that nourishes others, and what ritual of acknowledgement do you require before you let those others receive it.
How to read your Sedna placement
Your Sedna sign is almost certainly Taurus or Gemini because she is generational; the next section explains why. 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 the minor work. Wider than that, the body is generational background rather than foreground. Sedna in tight aspect to your Sun, Moon, Ascendant, Venus, or Mars rewrites the corresponding chart factor with the survivor signature. Aspects to slow movers (Pluto, Uranus, Neptune) are cohort texture, not personal.
Retrograde at birth turns the descent inward first. The survivor does the work in private before any of it surfaces. The available reading is to let the inward audit complete and then bring the findings out, on the survivor's own timing, without waiting for the inner perfection that never arrives.
Why almost everyone alive has Sedna in Taurus or Gemini
Sedna's orbit is roughly 12,886 years long, so each sign passage runs for centuries when she is near aphelion. She is currently approaching her 2076 perihelion, which means she is moving faster relative to Earth than at any point in the past several thousand years and her sign passages are now measured in decades rather than centuries. Sedna entered Aries around 1865 and stayed there until about 1965; she crossed into Taurus around 1965 and stayed there until about 2014; she crossed into Gemini between 2014 and 2018 (with several retrograde dips back into late Taurus) and will continue into Cancer and Leo during and after the perihelion years.
The practical effect: anyone born between roughly 1965 and 2014 has Sedna in Taurus. Anyone born from about 2015 onward has Sedna in Gemini. A small living cohort (the late Aries births of the early 1960s, with retrograde dips making the boundary fuzzy) still carries the older sign. The astrological literature has not always been clean about this. A page that promises a 'what your Sedna sign means' tour through twelve possibilities is mostly selling you historical reference for ten of them and the live ones for the two you might actually have. We give you all twelve here because the historical signs are still useful as comparative reading and because the post-perihelion ingresses will eventually fill the rest of the wheel, but we are not pretending the sign is doing the personal work for the current cohorts.
Sedna in aspect to your personal planets
Sedna conjunct, square, or opposite the natal Sun (within 1.5 degrees) wires identity itself to the survivor signal. The native often carries the wider family story of the dropped child, the institutional cast-out, or the line that was supposed to be inherited and was withheld. The work usually shows up as a long-form practice (creative, therapeutic, advocacy-based, ancestral) that argues with the polite version of survival across decades rather than as a single sharp incident.
Sedna on the Moon makes the survival a felt body-and-emotion experience rather than a chosen intellectual position. The native often had an early relationship to a caregiver who carried the cast-out signal, and the emotional weather of the household before words was already the weather of the deep. The work is rebuilding the body's relationship to safety from the inside, slowly, without rushing the timeline.
Sedna on the Ascendant means people read the survivor signal in your physical presence within minutes, often before you have spoken. Sedna on the Descendant puts the function in the partner seat: see the 7th-house entry below. Sedna aspects to Venus rewrite the love-and-pleasure narrative; the native cannot have the cozy version of partnership and tends to attract or be attracted to people carrying similar descents. Sedna on Mars is the activist temperament shaped by the survivor's clarity: at best, generative advocacy from the depths; at worst, the native fights every guardian-figure in the room because the original one cannot be confronted.
Sedna retrograde
Sedna is retrograde for roughly half of each year as Earth's faster orbital motion laps her, and the retrograde stations move only fractionally per year, so generations share the retrograde-direct status of natal Sedna in tight clusters. Natal Sedna retrograde is common, and the reading is that the descent goes inward first.
Natal Sedna retrograde turns the survivor inward before it turns outward. The native first works the wound privately, often through long-form contemplative, therapeutic, or written practice, before any of the work surfaces in public. The risk is internalized: the survivor becomes a private witness who never lets the outer disclosure happen. The available path is to let the inward audit complete and then bring the findings out, on the survivor's timeline, without waiting forever for an inner perfection that never arrives.
Transiting Sedna retrograde is a roughly annual invitation to revisit a specific descent-and-return already in motion. Whatever surfaced during the prior direct station gets a second look: was the disclosure accurate, were the people held during it, was the survivor's own footing recovered. The retrograde is for refinement and integration, not for new descents.
Sedna versus Chiron, Eris, Nessus, and Pholus
Sedna sits at the deep end of a wider 'wound' cluster of bodies, but each one names a distinct function and the cleanest chart work tells them apart rather than collapsing them.
Chiron is the personal injury that becomes a teaching gift. The signature is the wound that nobody else can heal but that the native can hold for others. The story is the master-teacher who could heal anyone except himself and the long apprenticeship that made him a teacher anyway.
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 party. Eris is the goddess who was not invited and showed up anyway with the golden apple.
Nessus tracks the abuse pattern as it travels down a chain: the boundary violation that gets passed from parent to child to lover to descendant until somebody in the line refuses to pass it on. The work is the deliberate halt of the chain.
Pholus is the small cause whose effect scales out of all proportion: the one drink that started the slide, the one casual remark that detonated, the moment of innocent-looking action whose consequences could not be unwound.
Sedna is none of these. Sedna is the betrayal by the guardian-figure who was supposed to protect, the long descent into the depths that followed, and the transformation of the cast-out into the body the next generation feeds from. The signature is specifically the guardian's failure and the survivor becoming provision. 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 Sedna signature precisely.
The Sedna perihelion of 2076
Sedna is currently approaching the closest point in her 12,886-year orbit. Her perihelion passage is centered around the year 2076, when she will be at roughly 76 AU from the Sun, the nearest she has been since the late ice age. Astronomically the event is a once-per-civilization opportunity to observe an inner Oort cloud body up close.
Astrologically the framing is not subtle. The descent has been pulling her, century by century, back into a position close enough to the personal solar system to make her readable, and the cohort that will live through the perihelion years is the cohort currently being born. Sedna in Gemini, the live placement for the youngest generation, is the cohort that will speak the depths as their native tongue during the perihelion era and the years that follow.
For older cohorts (Sedna in Taurus and the surviving Aries births), the 2076 perihelion is the long arc by which the work that began in the Taurus decades (the material betrayal, the dismantled safety net, the climate inheritance) becomes legible to a generation that was born already inside the rising water. The reading is to ask what your Sedna placement made you into that the perihelion-era cohort will be able to use.
Sedna through the 12 zodiac signs
A short interpretation of Sedna 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.
Sedna in Aries
the survivor who names it directly
Sedna in Taurus
the survivor inside material betrayal
Sedna in Gemini
the survivor speaking the depth
Sedna in Cancer
the survivor of the household line
Sedna in Leo
the survivor on the public stage
Sedna in Virgo
the survivor of broken daily care
Sedna in Libra
the survivor of the false treaty
Sedna in Scorpio
the survivor sovereign of the depths
Sedna in Sagittarius
the survivor of the cosmology
Sedna in Capricorn
the survivor inside the institution
Sedna in Aquarius
the survivor of the chosen kin
Sedna in Pisces
the survivor dissolving into provision
Sedna through the 12 houses
If you have an exact birth time, your Sedna 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.
Sedna in the 1st house
Sedna in the 2nd house
Sedna in the 3rd house
Sedna in the 4th house
Sedna in the 5th house
Sedna in the 6th house
Sedna in the 7th house
Sedna in the 8th house
Sedna in the 9th house
Sedna in the 10th house
Sedna in the 11th house
Sedna in the 12th house
Related Free Tools
Eris Calculator (136199)
Calculate dwarf planet 136199 Eris by sign, house, and aspects. Read the chart's disruptor of complacency, the part that names the rigged arrangement.
Chiron Sign Calculator
Find your Chiron sign, house, degree, and retrograde status. See your wounded healer placement in tropical and sidereal frames, with its natal aspects.
Pholus Asteroid (5145) Calculator
Calculate centaur 5145 Pholus by sign and house. Read as the small cause that flips a system, the moment a cork is pulled, not as a prediction of an event.
Nessus Asteroid (7066) Calculator
Calculate centaur 7066 Nessus by sign and house. Read as a pattern of cyclical harm and the point at which the pattern becomes interruptible, not as a verdict.
Free Lilith Sign Calculator
Find your Black Moon Lilith sign, house, and degree with Mean and Sidereal variants. Birth time and location improve the house result.
Chariklo Asteroid (10199) Calculator
Calculate centaur 10199 Chariklo by sign and house. Read the holding presence the chart can offer, the steady witness Chiron's wound work actually requires.
Asteroid Calculator
Calculate 22 asteroid, centaur, and dwarf planet signs and houses in one scan: Vesta, Pallas, Juno, Ceres, Eros, Psyche, plus Chariklo, Nessus, Eris.
Pluto Out-of-Bounds Dates
Computed Pluto out-of-bounds windows from 1900 to 2100 with peak declination dates for each cycle.
Frequently Asked Questions
What is Sedna in astrology?
Sedna is a candidate dwarf planet discovered in 2003 and named after the Inuit sea goddess whose father threw her overboard during a storm and severed her fingers when she clung to the kayak. Her body became the whales and seals of the deep, and she became sovereign of the sea and the souls of the dead. Astrologically, Sedna reads as the part of your chart that survived betrayal by what was supposed to protect you, the part that went to the depths and came back as the body the next generation feeds from. The sign is cohort-level (almost everyone alive has Sedna in Taurus or Gemini), the house tells you the territory of the descent, and the aspects to personal planets tell you how loudly the survivor reads.
How do I find my Sedna sign and house?
Enter your birth date, time, and place above. The calculator returns Sedna'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, the same source the rest of the Augurine engine uses for transits and timing. The sign is generational; 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 does almost everyone have Sedna in Taurus or Gemini?
Sedna has roughly a 12,886-year orbit with a strongly elliptical shape: she covers each sign for several decades when she is approaching perihelion (her closest point to the Sun, due in 2076) and for centuries when she is near aphelion. Sedna entered Aries around the 1860s, ingressed Taurus around 1965, ingressed Gemini around 2015, and is accelerating through the personal signs as she nears perihelion. Anyone born between 1965 and roughly 2014 has Sedna in Taurus. Anyone born from about 2015 onward has Sedna in Gemini. The sign is a cohort claim, not a personal one; the house and aspects do the personal work.
What does Sedna retrograde mean in a natal chart?
Sedna is retrograde for roughly half of each year as Earth laps her in the orbital dance, and the retrograde stations move by less than half a degree per year, so generations share the retrograde-direct status of natal Sedna in tight groups. Natal Sedna retrograde turns the descent inward before it turns outward: the survivor first works the wound privately, often through long-form contemplative or written practice, before any of the work surfaces publicly. The available path is to let the inward work complete and then bring the findings out, on the survivor's timeline, without waiting for the inner perfection that never arrives.
How is Sedna different from Chiron, Eris, Nessus, and Pholus?
All five bodies touch the wider 'wound' territory but they are distinct functions. Chiron is the personal injury that becomes a teaching gift. Eris names the rigged arrangement the wider system has agreed to ignore. Nessus tracks the abuse pattern passing down a chain. Pholus is the small cause whose effect scales out of proportion. Sedna is the betrayal by the guardian-figure who was supposed to protect, the long descent that follows, and the transformation of the cast-out into the body the next generation feeds from. The signature is specifically the guardian's failure and the survivor becoming provision; if your chart story is closer to one of the other bodies, read that one first.
Is Sedna an asteroid or a dwarf planet?
Sedna is officially a candidate dwarf planet. The IAU has not formally placed her on the dwarf-planet list because, despite her likely mass and roundness, the long observation arc required to settle the question astronomically is still in progress. Astronomers including Mike Brown (her discoverer, also the discoverer of Eris) consider her almost certainly a dwarf planet, and the Minor Planet Center catalogues her with the dwarf-planet candidate set. Astrologically we read her with the dwarf-planet and outer-body interpretive grammar (slow movers, cohort-level signs, personal house and aspects) rather than the personal-asteroid one.
What was the Sedna ingress into Gemini in 2014?
Sedna crossed from Taurus into Gemini in stages between approximately 2014 and 2018, with several retrograde dips back into late Taurus before settling fully into the new sign. The window corresponded with the rise of large-scale public testimony movements (the 2017 wave of disclosure inside multiple institutions and industries), the maturation of the post-2008 austerity generation, and the public emergence of the youngest Sedna cohort under their own name. The exact ingress dates depend on which Sedna fit you read, but the cultural signature of the transition is clear: a generation whose specialty is naming the cast-out in their own native speech.
Explore your complete chart
Your Sedna placement is one voice. See your full chart, timing, and compatibility in Augurine.