Timing and cycles
Planetary Hour
Direct answer
Planetary Hour: A Planetary Hour is an unequal hour ruled by one of the seven traditional planets, calculated from sunrise and sunset rather than from fixed clock hours.
A Planetary Hour is a traditional time division ruled by a planet.
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At a glance
- Found in
- Transits & Cycles
- Related
- Birth Chart, Zodiac, Transit
A Planetary Hour is a traditional time division ruled by a planet.
The orbit map distinguishes physical bodies, calculated points, and symbolic cycles where possible.
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What sets Planetary Hour apart
The planetary hour is one twelfth of the daylight, or of the night, so its length changes with the season and latitude. Near the equinoxes it is about 60 minutes. In summer at a northern place the daytime hours stretch past an hour and the night hours shrink, and in winter the reverse. The first hour of the day belongs to the planet of the day, and because 24 does not divide by 7, the 25th hour falls to a different planet, which is how Sunday leads to Monday.
- Length: daylight or night divided by 12, so hours are unequal
- Start point: sunrise for day hours and sunset for night hours
- First hour: always belongs to the ruler of the weekday
- Why days run in order: 24 hours around a cycle of 7 moves the first hour on by three planets each day
- Alternate name: temporal or seasonal hours, as opposed to equal clock hours
Often mistaken for something else: An equal clock hour is always 60 minutes; a planetary hour is a twelfth of the day or night and can be 40 or 80 minutes.
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The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
The story behind Planetary Hour
Planetary hours follow the Chaldean order of Saturn, Jupiter, Mars, Sun, Venus, Mercury, and Moon, dividing daylight and night each into twelve unequal hours.
Planetary Hour in the Bible
Planetary hours should remain symbolic timing language, not ritual instruction, command, or spiritual compulsion.
Why Planetary Hour matters
Planetary Hour matters because it connects the day, sunrise, sunset, and Chaldean planetary order into a timing layer. Traditional astrologers may use it in electional astrology, horary radicality, and timing symbolism.
Planetary Hour in practice: an example
A Mercury hour may be considered more fitting for a message, study session, or negotiation, but the full election still matters.
Where readings of Planetary Hour go wrong
A common error is to pick a planetary hour while ignoring the Moon, chart condition, ethics, or practical readiness.
What does Planetary Hour mean for you?
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Sources and editorial method
Research references used for this entry include:
- Source
- The Great Almanac Dictionary
- Category
- Transits & Cycles
- Last updated
- 2026-09-26
Related terms
More in Transits & Cycles
- Progressed Quarter Moon
- Solar Eclipse
- Transit Cluster
- Venus Retrograde
- Cazimi
- First Quarter Moon
- Lunar Mansion
- Moon Phase
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Common questions
What is a Planetary Hour?
A Planetary Hour is an unequal hour ruled by one of the seven traditional planets, calculated from sunrise and sunset rather than from fixed clock hours.
Where does a Planetary Hour come from?
Planetary hours follow the Chaldean order of Saturn, Jupiter, Mars, Sun, Venus, Mercury, and Moon, dividing daylight and night each into twelve unequal hours.
What does a Planetary Hour look like in a birth chart?
A Mercury hour may be considered more fitting for a message, study session, or negotiation, but the full election still matters.
What do people get wrong about a Planetary Hour?
A common error is to pick a planetary hour while ignoring the Moon, chart condition, ethics, or practical readiness.
