A private observatory

Your birth chart — and nine ways to read your sky.

Your birth moment, the people around it, and the sky above you — cast in your browser, never uploaded.

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 without creating an account.

Cosmic Meridian calculates chart data in a Web Worker and keeps birth moments, coordinates and results inside this browser session.

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

Or begin here

Natal chart

Your cosmic starting point.

Choose the day, local time and city you were born — the city sets the zone, and that moment becomes your chart.

Birth place

An offline city list. Nothing goes online.

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

Your birth details stay on this device and are never sent. A successful cast is kept only in this tab's own memory until you clear it or close the tab.

Start with the moment you arrived.

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 →