Calculation
Where the planets are
Positions, aspects, houses and exact times come from astronomy, worked out on Celestia’s own calculation service for the precise moment. They are measured, not written.
An app by Twixalot
For iPhone and Android
Celestia
Astrology, worked out to the second and explained in plain words.
A calm astrology app for iPhone and Android. Your birth chart, daily transits, compatibility and the sky tonight, calculated precisely for the moment and place you were born, with every reading clearly marked as interpretation.
Coming soon to the App Store and Google PlaySee inside
Inside Celestia
Five ways to read your sky
Start with your birth details. Everything else is worked out from them: your chart, what the planets are doing to it now, and how it meets someone else’s.
Birth Chart
Your chart wheel, with your Sun, Moon and Rising sign, and every placement explained.
Horoscope
Today, this week and this month, from the planets touching your own chart.
Match
Compatibility between two real charts, not just two Sun signs.
Insights
Tonight's Moon and the dates that matter for you over the next 30 days.
Zodiac
All twelve signs, drawn from the real stars of their constellations.
How it works
Calculated first, then interpreted, and always labelled
Interpretation
What astrology says it means
Readings are built from a reviewed set of core meanings for each planet, sign, house and aspect, and every reading says that it is interpretation. Where no reading is ready, you see only what is calculated.
Astrology is a tradition of meaning, not a science. Celestia is for reflection and enjoyment. It doesn’t predict events and isn’t medical, financial or legal advice.
Calculated, never estimated
Planet positions are worked out for the exact moment and place of birth, from NASA JPL’s DE441 ephemeris.
To the second, in your time
Moon phases, sign changes and exact transits are found to the second and shown in your local time.
No guessed Rising sign
Without a birth time, your Rising sign, Midheaven and houses are left out instead of guessed.
Every result shows its working
Open any result to see the positions, the orb and why it was listed.
Familiar methods
Tropical signs from the March equinox and Placidus houses, with Porphyry near the poles, where the chart says so.
Works offline
Your latest results are kept on your phone, so they’re still there without a connection.
Privacy
Your birth details are yours
A birth chart needs personal details, so Celestia keeps as little as it can, sends only what a calculation needs, and lets you delete everything yourself.
Read the Privacy PolicyKept on your phone
Your birth details and the people you add stay in Celestia’s private folder on your phone.
An account only if you want one
Add your email to keep a copy in your account and sign in on a new phone. Only you can read it.
No ads, no tracking
There’s no advertising, no analytics and no tracking in the app.
Delete it all, any time
Delete your data, or your whole account, from Settings in the app.
Built by Twixalot
Designed and built in Zurich, from the app to the calculation service behind it
Celestia is Twixalot’s own product: a Flutter app for iPhone and Android, a Python service for the astronomy, and accounts that keep personal data private. If you have an app in mind, we can build yours too.