Planetary Hours Calculator
Planetary hours divide each day and night into 12 equal parts, ruled in sequence by the seven classical planets — Saturn, Jupiter, Mars, Sun, Venus, Mercury, and Moon. The length of each hour varies by season and location, calculated from the exact times of sunrise and sunset. This calculator uses your chosen city's coordinates to compute accurate planetary hours for any date. Magicians and practitioners of ceremonial magic use planetary hours to time their workings — prayers, rituals, and invocations — to the planet that governs the desired outcome, aligning earthly actions with celestial influence.
Frequently Asked Questions
What are planetary hours?
Planetary hours are a system from Hellenistic astrology and the Hermetic tradition that divides each day and night into 12 unequal segments, each governed by one of the seven classical planets: Saturn, Jupiter, Mars, the Sun, Venus, Mercury, and the Moon. The ruling planet of the first hour of each day gives that day its name — the Sun rules Sunday, the Moon rules Monday, Mars rules Tuesday, and so on.
How does this calculator work?
The calculator finds the precise sunrise and sunset times for your chosen city and date. The daylight span is divided into 12 equal day hours; the remaining nighttime span is divided into 12 night hours. The first hour of the day is always ruled by the planet that governs that day of the week, and the sequence follows the traditional Chaldean order from there.
Which planet rules the current hour?
The currently active planetary hour is highlighted in the table. The ruling planet changes with each new hour, so check back throughout the day. The angel name shown alongside each hour is the traditional angelic intelligence associated with that planet's influence.
What are planetary hours used for in High Magick?
Practitioners of High Magick use planetary hours to align their rituals, petitions, and workings with the celestial influence of the appropriate planet. For example, matters of communication and knowledge are best addressed during Mercury hours; matters of love and harmony during Venus hours. Deeper guidance on incorporating planetary timing into your practice is available on our Patreon.
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