Your complete birth chart.
Your Sun, Moon, and rising, every planet, the houses, and the aspects between them, calculated from your exact birth moment and kept on your device.
What you're looking at
A birth chart is a snapshot of the sky from where you were born, at the minute you were born. The wheel shows the twelve signs around the outside, the twelve houses inside, and each planet placed at its exact degree. Three placements carry most of the story for beginners:
- Sun — your core identity; the sign most people already know.
- Moon — your emotional weather; how you feel and recharge.
- Rising (ascendant) — the sign coming over the eastern horizon as you were born; how people first read you, and what lays out your houses.
The lines across the middle are aspects — angles between planets that astrologers read as conversations: trines flow, squares argue productively, oppositions negotiate.
Every chart lists the exact time and place it was calculated from, its coordinates, and its house system, so nothing is taken on faith. The positions are tested against NASA JPL reference data on every change. Here is exactly how it is computed.
Questions, answered
What is a birth chart?
A birth chart (or natal chart) is a map of where every planet sat — from your point of view on Earth — at the exact moment and place you were born. It records your Sun, Moon, and Rising signs plus the positions of Mercury through Pluto across twelve houses.
Do I need my exact birth time?
For your rising sign and houses, yes — the ascendant changes roughly every two hours. Without a time we compute planets for noon: your Sun and usually your Moon are still exact to the day. Birth certificates, baby books, and parents are the usual sources.
How accurate is this calculator?
Planetary positions are computed with a professional-grade astronomical engine and are continuously tested against NASA JPL reference data to within a few hundredths of a degree — the same standard serious astrology software uses. Historical time zones, including pre-1922 local mean time and wartime clock changes, are resolved from the full IANA database.
What happens to my birth data?
Nothing leaves your device. The entire chart is computed in your browser; there is no account, no upload, and no server that ever sees your birth details. If you choose to save a chart, it is stored in your own browser only.
Whole sign or Placidus houses — which should I pick?
Whole sign is the oldest system and the friendliest to read: each house is one full sign. Placidus is the most common modern default and divides houses by time of rising, so their sizes vary. Try both — your planets stay put; only the house boundaries move.