The sky, as it was

How your chart is made

We convert your birth date, time and place to Universal Time using the historical timezone rules for that place, then compute where the Sun, Moon and planets were. The chart uses the tropical zodiac, with Placidus or Whole Sign houses (your choice), the mean North Node, the Ascendant and Midheaven, and the major aspects.

If you don't know your birth time, we still place the planets in their signs but leave out houses and angles, which depend on the exact minute.

About the AI reading

The written reading and the chat are generated by a large language model (Anthropic's Claude, accessed through Vercel AI Gateway). The model is given only your computed chart data — the positions, houses and aspects you can see in the tables — and is instructed to interpret those, not to invent placements.

AI can still be wrong, generic or overconfident. Treat what it says as a prompt for your own reflection. It is not medical, legal, financial or psychological advice. See Privacy for how your data is handled.

Attributions

• Place names, coordinates and timezones come from GeoNames, licensed under CC BY 4.0. We use the cities500 dataset, reduced to the fields needed for search.
• Planetary positions are calculated with Astronomy Engine by Don Cross, used under the MIT License.
• Historical timezone and daylight-saving rules come from the IANA tz database (public domain) via Luxon (MIT).
• Typefaces: Instrument Serif, Geist and Geist Mono, all under the SIL Open Font License 1.1.
• House, angle and aspect calculations are our own, based on the formulas in Jean Meeus's Astronomical Algorithms. Planet and sign glyphs are drawn for this site.

A note on astrology

Astrology isn't a science, and nothing here claims otherwise. The astronomy is real and precise; the meaning is a centuries-old symbolic language. We hope you find something useful in it.