Clavis: Planetary Clock

Know which classical planetary hour rules right now — computed from the true sunrise and sunset at your exact location.

Planetary Clock is a precise, beautifully simple planetary-hours clock.

Since antiquity, each day and night has been divided into twelve unequal hours, each governed by one of the seven classical planets in the Chaldean order. Planetary Clock computes these hours with astronomical accuracy from the true sunrise and sunset at your exact location.

• Current planetary hour — see which planet rules right now, with a live countdown to the next hour. • Ruler of the day — the classical planet that governs today. • Upcoming hours — a clear timeline of the planetary hours ahead, from sunrise to sunset and through the night. • Moon phase — the current phase and illumination of the Moon. • Monthly calendar — lunar phases and planetary hours at a glance, computed on your device.

Planetary Clock is free, with no ads, no accounts, and no sign-in. Open the app and read the sky.

Location is used only on your device to calculate sunrise, sunset, and the planetary hours — it is never transmitted.