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Planetary hours are one of the oldest timing systems in Western astrology, used continuously from ancient Hellenistic practice through the Renaissance and into modern ceremonial magic. The system divides each day and night into twelve hours apiece - not clock hours, but unequal hours calculated from the actual times of sunrise and sunset. Each of these 24 hours is ruled by one of seven classical planets in a fixed sequence.

How the System Is Calculated

The first hour after sunrise on any day is ruled by that day's ruling planet. Sunday belongs to the Sun, Monday to the Moon, Tuesday to Mars, Wednesday to Mercury, Thursday to Jupiter, Friday to Venus, Saturday to Saturn - a pattern still visible in English, French, and Spanish day names. The planetary hours then rotate through a specific sequence: Sun, Venus, Mercury, Moon, Saturn, Jupiter, Mars. After the seventh hour, the sequence repeats from the beginning. The same rotation continues through the night hours.

Because daytime and nighttime hours are calculated from sunrise/sunset rather than fixed 60-minute blocks, a daytime hour in December is considerably shorter than one in June. This is why a real-time calculator matters: the planetary hour at 3pm in London today is not the same as at 3pm in Buenos Aires, and both differ from the same time in January.

What Each Planet Governs

The Sun hour is the most favorable for things that need visibility, authority, and forward momentum - presentations, leadership decisions, making yourself known. Use it to step into the center.

The Moon hour governs intuition, emotional matters, home, and the unconscious. Read, dream, tend relationships, and avoid forcing conclusions.

Mars hours are for action that requires force, courage, or directness. Contracts that need firm negotiation, confrontations that have been deferred, physical work with high output. Not ideal for diplomacy.

Mercury hours are for communication, writing, study, short travel, and anything involving data or contracts. Send the email. Make the call. Sign paperwork.

Jupiter hours expand. Use them for beginning things you want to grow: new projects, financial moves, teaching, travel planning, anything you want the cosmos to enlarge.

Venus hours govern love, beauty, creativity, and harmony. Relationship conversations go better here. Creative work flows. Social events land well.

Saturn hours are for discipline, structure, and things that need to endure under weight: legal matters, serious planning, anything requiring patience and longevity.

How to Use the Table

The full-day table shows every hour from today's sunrise to tomorrow's sunrise with its ruling planet. Find the hour you are planning something for and read what energy is running. You are not locked into that energy - but working with it rather than against it typically requires less friction.

See the current planetary hour and the full table for your day.

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