Sun in Aries
You start before the room has agreed it is time. Aries Sun lives by ignition — work, arguments, and rooms get a first spark from you, then you have to stay long enough for heat to become a result.
Free birth chart calculator
Planetary positions computed from a VSOP87 / lunar ephemeris for your exact date, time and coordinates. Tropical zodiac, Placidus houses.
Calculate to draw the wheel — signs, houses, and the gold glyphs for your planets.
How a birth chart is calculated
A natal chart is a diagram of the sky from one place at one moment. Two inputs do the work: time, which fixes where each body sat along the ecliptic, and coordinates, which fix which part of that sky was rising. SideraChart resolves the birthplace to latitude and longitude, converts local clock time to Universal Time with the IANA timezone rules in force on that date, then reads planetary longitudes from a VSOP87-class ephemeris (astronomy-engine).
Positions are given in the tropical zodiac, measured from the vernal equinox — the Western convention. Sidereal longitudes differ by roughly 24° today and are not shown in this calculator.
Why birth time matters
The Ascendant moves about one degree every four minutes, so a twenty-minute error shifts it by five degrees and can change the sign entirely. The Moon moves roughly half a degree an hour. Sun through Pluto are stable enough across a day that an unknown time still gives a usable chart, minus the houses.
House systems
Placidus is the default because it is the most widely used, and most published interpretations assume it. It divides time rather than space, which makes houses uneven and breaks down above roughly 66° latitude; for births in the far north, Whole Sign is the more honest choice.
sources
astronomy-engine (VSOP87)IANA timezone databaseOpenStreetMap Nominatim
precision target
planets vs astro-seek < 0.5°Placidus + Whole Signorbs 8° / 6° / 4°
Sun in every sign
Your birth date, time and place decide which of these is yours — the calculator above works it out from the real position of the sky. Here is what each one means.
Sun in Taurus
You trust what can be touched, timed, and kept. Taurus Sun builds a life out of appetite and patience: money, food, craft, and the refusal to be rushed into a thinner version of the same thing.
Sun in Gemini
You think out loud and collect people the way other people collect facts. Gemini Sun stays interested by splitting attention — two projects, two conversations — and the skill is making the split look like range, not escape.
Sun in Cancer
You take the temperature of a room before you take a side. Cancer Sun protects what it loves by remembering: family, kitchens, old loyalties, the private history that other people treat as optional.
Sun in Leo
You need the thing to be seen, or it hardly happened. Leo Sun organises life around a stage — work with an audience, love with witnesses — and goes cold when effort is treated as background noise.
Sun in Virgo
You notice the one misaligned stitch and cannot pretend you did not. Virgo Sun serves by editing: health routines, sentences, other people’s plans. Usefulness is how you love; contempt is the shadow of the same eye.
Sun in Libra
You would rather arrange the conflict than sit inside it. Libra Sun reads the social geometry of a room and moves toward balance — sometimes as peace, sometimes as a charm that postpones the real decision.
Sun in Scorpio
You do not do shallow on purpose. Scorpio Sun wants the motive under the motive: who has power, who is bluffing, what will still be true after the performance. Intensity is not a mood; it is a method.
Sun in Sagittarius
You need a horizon or you start chewing the furniture. Sagittarius Sun lives by thesis — travel, belief, a bigger map — and gets reckless when the story gets smaller than your appetite for meaning.
Sun in Capricorn
You take time seriously, including other people’s. Capricorn Sun climbs in public and doubts in private: titles, structures, the long game. Respect is the currency; fatigue is what happens when the climb is the only personality left.
Sun in Aquarius
You stand slightly outside the circle even when you built it. Aquarius Sun belongs to ideas and to people-as-a-pattern: scenes, causes, future tense. Warmth has to be chosen, because detachment is the default talent.
Sun in Pisces
You pick up weather that is not yours and call it a day. Pisces Sun lives by permeability — art, care, the unnamed mood in a house — and has to learn the difference between compassion and disappearing.