Free instrumentCelestial Maps
Natal Chart Calculator with Today's Transits
This free natal chart calculator draws your birth chart from the date, time and place you were born. It places the Sun, the Moon, the planets from Mercury to Pluto, the true lunar nodes, the Ascendant and the Midheaven in the tropical zodiac, and divides the chart into twelve houses: Placidus by default, Whole Sign on request. Today's planets ride the outer ring, so you can see which transits touch your chart now. There is no account. Everything is computed in your browser, and the birth data you type is never sent to a server.
The map your soul wrote at birth, read against the sky as it moves.
Living Natal Chart
Tropical zodiac · geocentric · true nodeFirst reading
Reading your chart, step by step
Start with three points: the Sun, the Moon and the Ascendant, which the result calls the Three Lights. Then the houses: each is a field of life, and the house a planet stands in says where its theme plays out. The aspects show which planets work together and which pull against each other. Last, the transits list shows the slow planets now crossing your chart.
Hover over or tap any glyph on the wheel to read it, and click to pin it while you compare. For what each placement means in the esoteric tradition, read The Natal Chart as Your Soul's Curriculum; for the wider frame, the Esoteric Astrology guide.
The instrument
How the chart is computed
Every position is computed in your browser when you press the button. Your birth moment is first converted to Universal Time with the time zone rules of your birthplace for that date, daylight saving time included; the places come from a GeoNames list served by this site.
- Planets: geocentric positions from astronomy-engine, an open-source ephemeris library designed to be accurate to about one arc-minute, measured in the tropical zodiac along the ecliptic of date.
- Nodes: the true (osculating) lunar node, where the plane of the Moon's orbit at that moment crosses the ecliptic. The South Node sits opposite.
- Angles and houses: the Ascendant and the Midheaven from apparent sidereal time at your birthplace. Placidus houses by default, Whole Sign on request, and Porphyry where Placidus cannot be computed near the poles.
- Aspects: the five major ones, with orbs of 8° for a conjunction (10° with the Moon), 7° for an opposition, 6° for a trine or a square and 4° for a sextile.
- Transits: today's planets, recomputed every five minutes. The list keeps Jupiter to Pluto within 3° of an exact aspect to your chart, 4° for a conjunction.
Questions
Questions people ask
What do I need to calculate my natal chart?
Your date of birth, the time as exactly as you know it, and the town or city. Pick the place from the list: it carries the coordinates and the time zone, and the calculator applies that place's clock rules for the date, daylight saving time included, before it converts your birth moment to Universal Time.
What if I don't know my birth time?
Choose Time unknown and the chart is drawn for 12:00 local time. The planets' signs usually still hold, but the Moon can be up to about 7° off, enough to change its sign near a boundary, and a planet that changed sign that day may show in the wrong one. The Ascendant, the Midheaven and the houses depend on the exact minute, so treat them as unknown. A birth certificate or a hospital record is the best source for the time.
Why is my rising sign different on another website?
The rising sign (the Ascendant) moves through the whole zodiac in about a day, on average one degree every four minutes, so a birth time a few minutes off or a wrong time zone can move it into the next sign. Vedic charts use the sidereal zodiac, about 24° behind the tropical zodiac used here, so most placements fall one sign earlier there. The house system changes the houses, never the Ascendant.
Placidus or Whole Sign: which house system should I use?
Placidus, the default here, divides into thirds the time each degree of the zodiac takes to travel from the horizon to the meridian; it is the default in most Western astrology software. Whole Sign makes the rising sign the first house and each following sign the next house; it is the oldest known house system, used in Hellenistic astrology. Signs and aspects stay the same in both, only the house a planet falls in changes. Near the polar circles Placidus cannot be computed, and the calculator switches to Porphyry houses.
What do the two rings and today's transits show?
The inner gold ring is your birth sky. The pale, dotted outer ring is the sky now, recalculated every five minutes while the page is open. Under Today's Sky Touching Yours the calculator lists Jupiter, Saturn, Uranus, Neptune and Pluto when they are within 3° of an exact aspect to a planet, a node or your Ascendant (4° for a conjunction). Faster planets are drawn on the ring but not listed, because they pass in days.
Is my birth data stored or sent anywhere?
Only if you ask for the chart by email. The chart is computed in your browser, and the place search runs against a GeoNames list downloaded from this site, so nothing you type is sent. Your browser keeps the last birth data you entered so the chart reopens next time; Recompute with new birth data deletes it. If you use Email me this chart under the result, the chart and the birth date, time and place name are sent once to build that email and are not stored by Pleroma; Resend, which delivers it, keeps a copy of the sent email for 30 days. If you accept analytics, the site counts that a chart was drawn or emailed and which house system was used, never the birth data.
How accurate are the positions?
They come from astronomy-engine, an open-source library designed to be accurate to about one arc-minute and tested against NOVAS and NASA's JPL Horizons. The node is the true (osculating) node, not the mean node, which can differ from it by more than 1.5°. The Ascendant and the Midheaven come from apparent sidereal time and the true obliquity at your birthplace.
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