Planetary Hours Calculator

The planetary hour now, from your own sunrise and sunset.

How to find the planetary hours today

1. Choose your city, tap Use my location, or enter coordinates. Your location stays on your device.
2. Read the hour now: its planet, when it ends, and whether it is a double power hour, the planet's hour on its own day.
3. Tap a planet under When is the next hour of... to find its next four hours, day or night: the Venus hours today and tomorrow, say, for love or reconciliation work.
4. Step through the day table with Prev day and Next day to plan a working ahead.

Planetary hours chart

The ruler of each hour by weekday. Day hours count from sunrise, night hours from sunset; the clock times change with the season and your latitude, which is what the calculator works out.

Read across any row and the order never breaks: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon, then Saturn again. The 25th step lands on the next day's ruler, which is why the weekdays fall in the order they do. The planetary days guide walks through that arithmetic.

How the hours are counted

Planetary hours, also called astrological hours, are not clock hours. Daylight from sunrise to sunset is split into 12 equal hours and the night from sunset to the next sunrise into 12 more, so a summer day hour can run well over 70 minutes and a winter one under 50. Near the equinoxes both sit close to an hour.

The calculator times sunrise and sunset for the upper edge of the Sun with standard refraction, the convention almanacs use, to within about a minute. Above the polar circles the Sun can stay up or down all day; the tradition has no hours to count then, and the calculator says so.

Which hour for which working

The day sets the broad weather and the hour the local gust, so practitioners also mix them: a Venus hour on a Saturday to end something gently, a Mars hour on a Thursday for the nerve to ask for more. The correspondences and worked examples for each planet live in the planetary days guide, and the lunar layer that sits on top of both is in moon magic and the moon phase calendar.