True Sidereal Calculator

The Sun crosses the small, bright arc of Aries from mid-April into the second week of May, so the constellation opens its season roughly four weeks after tropical Aries does. Many people who carry a sidereal Aries Sun read as tropical Taurus on a conventional chart, which is part of why the placement surprises them: the initiating, first-to-move quality sits underneath a steadier surface.

Read this band as raw initiative looking for a clean target. The work is aim more than nerve. Aries rarely hesitates about whether to act, so the growth edge is the brief contact with reality before the charge, the moment that turns force into direction rather than friction.

Sun here roughly Apr 18 to May 14 · about 26 days · 29° wide

Taurus is one of the wider ecliptic constellations, and the Sun moves through it for more than five weeks, anchored by the red eye of Aldebaran. Its sidereal season runs from mid-May into the solstice, so a tropical Gemini Sun often turns out to hold a sidereal Taurus placement, with more patience and appetite for the concrete than the tropical label suggests.

This is the part of the sky that builds slowly and keeps what it makes. It values steadiness, sensory pleasure, and the security of a thing you can hold. The shadow is inertia: holding a position past its usefulness because moving costs comfort. Worth here is something you cultivate rather than seize.

Sun here roughly May 14 to Jun 21 · about 38 days · 36° wide

The Sun travels the twin stars of Castor and Pollux from the solstice through mid-July. Sidereal Gemini sits roughly a sign later than its tropical namesake, so a tropical Cancer Sun frequently reads as sidereal Gemini, with a quicker, more curious, more verbal current than the watery label implies.

This band collects, connects, and relays. It thinks by talking and learns by sampling widely. The strength is range and adaptability; the cost can be a thin contact with any one thing. Gemini does its best work when curiosity lands somewhere long enough to become understanding rather than a stack of open tabs.

Sun here roughly Jun 21 to Jul 20 · about 29 days · 28° wide

Cancer is a faint, narrow constellation, and the Sun clears it in about three weeks of high summer. Because the band is so much smaller than the even tropical sign, a sidereal Cancer Sun is comparatively uncommon, and it usually belongs to someone the tropical chart calls a Leo.

Read this as the instinct to make a safe inside and tend what lives there. It works through care, memory, and belonging rather than display. The protective reflex is the gift and the trap: the same shell that keeps the soft thing safe can keep it hidden. Cancer grows by choosing when to open the door.

Sun here roughly Jul 20 to Aug 10 · about 21 days · 20° wide

The Sun moves through the long sickle of Leo, anchored by Regulus, for more than five weeks from August into mid-September. Sidereal Leo runs about three weeks behind tropical Leo, so a tropical Virgo Sun often carries this warmer, more expressive placement underneath a modest exterior.

This is the part of the sky that wants to give heat and be seen giving it. It leads through presence and generosity, and it needs an audience the way a fire needs air. The shadow is performance for its own sake. Leo is at its best when the warmth is offered first and the recognition follows rather than the other way around.

Sun here roughly Aug 10 to Sep 16 · about 37 days · 36° wide

Virgo is the widest constellation on the ecliptic, and the Sun spends about six and a half weeks crossing it, longer than in any other sign. Its sidereal season reaches deep into what the tropical calendar calls Libra, so a tropical Libra Sun very often holds a sidereal Virgo placement.

Read this band as the drive to refine, to make a thing correct and useful. It serves through skill and attention to the part others skip. The width of the constellation suits the placement: there is a lot of ground to work, and the temptation is to keep adjusting past the point of done. Virgo grows by letting good enough be finished.

Sun here roughly Sep 16 to Oct 31 · about 45 days · 44° wide

The Sun passes through Libra, whose brightest stars still carry the old name of the Scorpion's claws, across the back half of autumn. Sidereal Libra sits roughly a sign later than tropical Libra, so a tropical Scorpio Sun is a common home for this more relational, more balance-seeking placement.

This is the part of the sky that holds two sides at once and looks for the fair arrangement between them. It works through relationship, proportion, and the considered choice. The shadow is the deferred decision, balance used as a way to avoid committing. Libra matures when weighing becomes a path to a verdict rather than a substitute for one.

Sun here roughly Oct 31 to Nov 23 · about 24 days · 23° wide

Scorpius is the great surprise of the true sidereal sky. The Sun spends only about seven days in it, anchored by the red heart of Antares, before crossing into Ophiuchus. That makes a sidereal Scorpius Sun genuinely rare, far rarer than the even tropical sign, and it belongs to a narrow band of late-November births.

Read this as concentrated intensity, the instinct to go all the way into a thing or leave it alone. It works through depth, focus, and the willingness to sit with what others avoid. The brevity of the Sun's passage suits the placement: this is a sharp, undiluted current, and its work is aiming that depth at something worth it rather than letting it turn inward as suspicion or control.

Sun here roughly Nov 23 to Nov 30 · about 7 days · 7° wide

Ophiuchus is the constellation the tropical zodiac leaves out. The Sun genuinely crosses it from about the last day of November to the middle of December, between Scorpius and Sagittarius, so anyone born in that window holds a sidereal Sun no twelve-sign system can name. The figure is Asclepius, the healer who learned to bring back the dead, holding the serpent of medicine and renewal.

There is no inherited canon for this placement, which is part of its character: it sits at the seam between Scorpius depth and Sagittarius reach. Read it as the impulse to work with what is wounded or hidden and to carry knowledge across a threshold, the healer who has been to the underworld and returned with something useful. Take it as a layer rather than a verdict, an extra room the tropical chart never drew.

Sun here roughly Nov 30 to Dec 18 · about 18 days · 18° wide

The Sun crosses Sagittarius, whose core stars form the Teapot pointing toward the galactic center, from mid-December into late January. Sidereal Sagittarius runs about three weeks behind its tropical namesake, so a tropical Capricorn Sun often carries this more searching, more far-sighted placement under a pragmatic surface.

Read this band as the reach for meaning past the immediate, the arrow loosed at a distant mark. It works through exploration, conviction, and the wide view. The shadow is the conviction that outruns the evidence, the answer announced before the question is understood. Sagittarius does its best work when the search stays honest enough to be corrected by what it finds.

Sun here roughly Dec 18 to Jan 20 · about 33 days · 34° wide

Capricornus, the faint sea-goat, takes the Sun from late January into the middle of February. Its sidereal season overlaps what the tropical calendar calls Aquarius, so a tropical Aquarius Sun often holds a sidereal Capricornus placement, with more structure and patience than the airy label suggests.

Read this as the discipline that builds toward a summit over time. It works through responsibility, endurance, and respect for what is earned rather than given. The shadow is the climb that forgets why it started, status pursued as its own reward. Capricornus matures when the mountain is chosen on purpose and the cost is paid with open eyes.

Sun here roughly Jan 20 to Feb 16 · about 27 days · 27° wide

The Sun passes through Aquarius, the water-bearer pouring its stream toward the southern fish, across the back of winter. Sidereal Aquarius sits roughly a sign later than tropical Aquarius, so a tropical Pisces Sun is a frequent home for this more detached, more systems-minded placement.

Read this band as the step back that sees the pattern, the loyalty to an idea or a group over the immediate and personal. It works through originality, principle, and a certain cool distance. The shadow is the distance that becomes disconnection, the principle held against the actual people in front of you. Aquarius grows when the wide view stays warm.

Sun here roughly Feb 16 to Mar 12 · about 24 days · 25° wide

Pisces is a wide, dim constellation, and the Sun spends more than five weeks in it from mid-March to mid-April, including the spring equinox. Because the band reaches well past the tropical equinox point, a tropical Aries Sun very often turns out to hold a sidereal Pisces placement, softer and more permeable than the fiery label implies.

Read this as the edge between self and everything else thinning out. It works through empathy, imagination, and a sensitivity that takes in more than it can always sort. The shadow is the boundary that dissolves too far, escape mistaken for transcendence. Pisces does its best work when the openness is given a form to flow through rather than left to flood.

Sun here roughly Mar 12 to Apr 18 · about 37 days · 33° wide