traditional astrology · sunrise-to-sunrise clock
Planetary Hours Calculator
Calculate all 24 planetary hours for a place and date from the actual sunrise, sunset and next sunrise. The table shows unequal seasonal hours, the weekday ruler and the current hour when applicable.
Choose a local day and place
How planetary hours are built
Daylight is divided into twelve equal parts and the following night into another twelve. Their clock length changes with season and latitude. The first hour after sunrise belongs to the weekday ruler; later hours follow the repeating Chaldean order Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon. This order is historical, not a claim that modern sixty-minute hours carry planetary forces.
Why location matters
Sunrise and sunset depend on latitude, longitude and date. Near the polar circles a sunrise or sunset may not occur on a selected day; the calculator reports that instead of inventing a schedule.