About Starhour

Starhour is an astrology app for iPhone and iPad. It maps your birth chart against the next 24 months and shows when windows for love, work and home open for you. It is made by Arkaledge. You can reach us at support@starhour.app.

How Starhour calculates your chart

Everything starts from real astronomy. From your birth date, time and place, Starhour calculates where the Sun, Moon and planets actually were in the sky, using the open-source Astronomy Engine library. It uses the tropical zodiac, the one most Western astrologers use, and works out your Rising sign and Midheaven from your birth time and place. Houses are counted whole-sign, starting from your Rising sign.

If you don't know your birth time, Starhour reads your chart for midday. It leaves out the parts that depend on the exact time, such as your Rising sign and houses.

How the timing works

Your timeline comes from the slow-moving sky: Jupiter, Saturn, Uranus, Neptune and Pluto crossing the points of your birth chart, eclipses, and the Moon's nodes. It also uses the planetary periods of Vedic astrology (Vimshottari dasha). Starhour scores each month for love, work, home and you.

Before it shows you any future dates, Starhour picks a few past months your chart says should have mattered and asks whether they did. Your answers change how much each kind of signal counts for you, so the timeline that follows is tuned to your own history.

Who writes the readings in the app

Your readings in the app are written by Claude, Anthropic's AI, from your calculated chart and the sky on the day. That's why they change as the planets move and as you answer the evening check-in. The AI writes the words. The dates, positions and scores come from the calculations above.

How we write the guides on this site

This site has free guides: the astrology calendars, sign compatibility and planets in signs. Here is how they're made.

• Facts are calculated, not written. Every date and time on the calendar pages is calculated by our own code from the planets' real positions: Full and New Moons, retrogrades and their shadow periods, eclipses, and when a planet enters a sign. The same goes for each sign's element, mode and ruling planet. No AI is involved in any of this.
• Compatibility scores follow one fixed rule. The score for two Sun signs comes from the classic angle between them, the same rule for every pair. A trine (same element) scores 90, a sextile 82, the same sign 74, opposites 68, neighboring signs 56, a square 52 and a quincunx 46. Sun signs are only a starting point. The app compares both full birth charts.
• The words are drafted with AI and follow a written brief. The descriptions are drafted with the help of Claude, following our style brief. They must be specific to the exact pair or placement, agree with the calculated score, never promise outcomes or give medical, legal or financial advice, and never call a pairing doomed. Before any page is published, an automatic check compares every element, mode, ruling planet and dignity named in the text with the zodiac tables. It also enforces the brief and flags sentences repeated across pages.
• They're kept up to date. Each page shows the date it last changed.

Spot a mistake? Write to support@starhour.app and we'll fix it.

What Starhour is not

Astrology is a tool for reflection, not a science that predicts events. Starhour is for reflection and entertainment. It isn't a substitute for medical, legal, financial or psychological advice. See our terms and privacy policy.