Planetary hours
The classical day divides daylight and night into twelve unequal hours each. Each hour is ruled by a planet in Chaldean order, beginning with the ruler of the weekday at sunrise. Computed from real sunrise and sunset in your browser.
How planetary hours work
Daylight from sunrise to sunset is split into twelve equal parts, and night from sunset to the next sunrise into twelve more. Near the solstices these “hours” are well longer or shorter than 60 minutes.
The first hour after sunrise is ruled by the planet of the weekday — the Sun on Sunday, the Moon on Monday, and so on. Each following hour steps through the Chaldean order (Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon) and wraps around. See the current sky and moon calendar.
Reference, not advice
This is cultural and astronomical reference, not personal prediction or advice.
Planetary hours are a traditional division of the day. The rulerships are cultural reference, not a prediction or recommendation about when to act.
Last reviewed .