A private observatory

Your birth chart, clearly.

Find your Sun, Moon and rising sign. Calculate in your browser, without an account.

Start with your birth date
Know your birth time? Create your birth chart

Your birth details stay on this device unless you save them to an account.

Birth chart

Your birth details

Your birth city sets the time zone.

Birth place

City search runs on your device. Your search is not sent.

Set the place manually

Coordinates are optional here. A recognized IANA time zone (for example Europe/Warsaw) is enough to apply the correct historical offset, but the rising sign and houses need latitude and longitude too.

Birth date
Birth time

Pick a city to apply its time zone

Loading chart tools…

The calculation runs in your browser. Birth details are sent to your account only if you choose Keep this chart.

Enter your birth details to begin.

Today for your sign

Your horoscope for today, written from the sky

AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
All twelve, and how they are written
The Natal SkySun, Moon, rising and every planet at the minute you were born.Open your sky The Moon at Your BirthIts sign and exact degree — the tide beneath the day.Find your Moon The Eastern HorizonYour Ascendant — the sign climbing the sky as you arrived.Find your rising Sun, Moon & RisingThe three anchors of a chart, read together on one page.Read the three Two Skies in ConversationLay one chart over another — every contact, house and reading between you.Compare two skies The Chart Between YouOne chart for a pairing — the midpoint, or a real Davison sky.Cast the chart The Sky Over Yours, TodayWhich planets are touching your chart now — and when each contact is exact.See today's sky The Sun's ReturnYour solar return for any year, cast wherever you will be.Cast your return The Hours of the PlanetsSunrise to sunset in twelve unequal hours, each ruled in turn.See this hour

Sky today

The sky over everyone, right now.

HoroscopeToday's text for your sign.Read today The MoonIts sign and phase this moment, computed in your browser.Read the Moon MercuryDirect, in shadow or retrograde — and the next station's date.Check Mercury Void of courseWhether the Moon is void now, in your own time zone.See the windows

Direct answer

What does this birth chart calculator do?

Calculate a birth chart in your browser, then explore natal placements, synastry, transits and sky events — an account is optional.

Cosmic Meridian calculates chart data in a Web Worker and keeps birth moments, coordinates and results in this browser unless you choose to keep a chart in an optional account; your last birth details are remembered on this device until you press Forget or choose Don’t remember.

Read how the astronomy, chart conventions and symbolic limits fit together.

Choose a different lens

Paired StarsUse a lighter two-person Sun-sign reflection when you do not need another full birth chart.Compare two signs Your AI TarotMove to a separate three-card reflection that asks for no birth details.Draw three cards

Method & limits

Wonder, with its feet on the ground.

Tropical, geocentric, from Astronomy Engine — no medical, legal, financial or predictive advice.

How we calculate