Planetary Hours — Today's Chaldean Rulers

How to use

1. Enter today's sunrise and sunset for your location.
2. Read the hour rulers.
3. Copy the table.

About this tool

A planetary hour is not sixty minutes. The tradition divides the daylight between sunrise and sunset into twelve equal parts, and the night between sunset and sunrise into twelve more, so in summer a daytime planetary hour is longer than a clock hour. Rulership follows the Chaldean order — Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon — and the first hour of the day takes the planet the day is named after. This calculator does that division properly using your sunrise input, which is the part most online versions skip. This tool applies traditional numerology and astrology rules exactly as those systems define them. Those systems are cultural traditions, not measured science, so treat the result as a prompt for reflection rather than a prediction.

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