Planetary Hours Explained Simply

Planetary hours are one of the oldest timing systems used in magic, astrology, and spiritual practice. The idea is simple: different times of day are governed by different planets, and each planet carries a distinct energy. By working during the right planetary hour, you align your actions with celestial forces that support your intention.

This isn't modern invention. Planetary hours were used in ancient Babylon, formalized by Greek and Roman astrologers, and practiced continuously through the medieval period into the present day. They remain a cornerstone of ceremonial magic, traditional witchcraft, hoodoo, and Hermetic practice. Even if you've never heard the term before, you've encountered the system — it's why Tuesday is named after Mars (Tiw/Tyr), Thursday after Jupiter (Thor), and Saturday after Saturn.

How Planetary Hours Are Calculated

Unlike clock hours, which are always 60 minutes long, planetary hours are based on actual daylight and darkness. Here's how it works:

Take the period from sunrise to sunset — that's your "day." Divide it into 12 equal parts. Those are your 12 daytime planetary hours. Then take sunset to the next sunrise — your "night" — and divide that into 12 equal parts. Those are your 12 nighttime planetary hours.

This means planetary hours change length with the seasons. In summer, when days are long, daytime planetary hours might be 75 minutes each while nighttime hours are only 45 minutes. In winter, the reverse is true. On the equinoxes, when day and night are equal, each planetary hour is exactly 60 minutes.

The Chaldean Order

Each planetary hour is ruled by one of the seven classical planets. The planets follow a fixed sequence called the Chaldean order — named after the ancient Babylonian civilization that established it. The order runs from the slowest-moving planet (as seen from Earth) to the fastest:

This sequence repeats infinitely. Once you reach the Moon, you go back to Saturn and continue.

The first hour of each day — starting at sunrise — is always ruled by the planet that governs that day. This is actually the origin of the day names:

Day	Planet	1st Hour Ruler	Origin
Sunday	☉ Sun	Sun	Sun's day
Monday	☽ Moon	Moon	Moon's day
Tuesday	♂ Mars	Mars	Tiw's day (Norse Mars)
Wednesday	☿ Mercury	Mercury	Woden's day (Norse Mercury)
Thursday	♃ Jupiter	Jupiter	Thor's day (Norse Jupiter)
Friday	♀ Venus	Venus	Freya's day (Norse Venus)
Saturday	♄ Saturn	Saturn	Saturn's day

From the first hour, the Chaldean sequence continues through all 24 hours of the day. If you count it out, you'll find that the sequence naturally leads the first hour of the next day to be ruled by the correct planet — an elegant mathematical property the ancients found deeply significant.

What Each Planet Rules

Each planet carries specific energies. Working during the matching hour aligns your intention with that energy:

Planet	Best For	Avoid
♄ Saturn	Banishing, protection, binding, discipline, endings, karma work	New beginnings, expansion
♃ Jupiter	Prosperity, luck, legal matters, growth, generosity	Binding, restriction
♂ Mars	Protection, courage, strength, victory, breaking obstacles	Peace work, reconciliation
☉ Sun	Success, healing, fame, vitality, confidence, leadership	Secrecy, hidden work
♀ Venus	Love, beauty, art, friendship, pleasure, fertility	Aggression, competition
☿ Mercury	Communication, travel, study, trade, divination	Long-term commitments
☽ Moon	Intuition, dreams, psychic work, emotions, water magic	Logic-heavy decisions

Double Power: Planet Day + Planet Hour

The most powerful moments occur when the planetary day and planetary hour match. A Mars hour on Tuesday (Mars day), or a Venus hour on Friday (Venus day), gives you what ceremonial magicians call "double rulership" — the planet's energy at maximum strength.

How to Actually Use This

For Beginners

Start with just the planetary day. It's the easiest to remember and doesn't require any calculations. Want to do a love spell? Do it on Friday (Venus day). Need protection? Tuesday (Mars day). Prosperity? Thursday (Jupiter day). That alone puts you ahead of most practitioners who ignore timing entirely.

For Intermediate Practitioners

Add planetary hours. Use our live calculator to find when the right hour falls during your waking time. Set a reminder. Prepare your materials beforehand so you're ready to begin the moment the hour starts.

For Advanced Practitioners

Combine planetary hours with moon phase (waxing for attraction, waning for banishing), moon sign (fire signs for Mars work, water signs for Moon work), and avoid void-of-course moon periods. Our planetary hours tool shows all of this in one view.

Traditions That Use Planetary Hours

Planetary hours are used across an enormous range of spiritual traditions, though each tradition may call them different things or emphasize different aspects:

In Ceremonial Magic (Golden Dawn, Solomonic, Enochian), planetary hours are essential — most operations specify the exact hour for rituals, consecrations, and spirit work. The Key of Solomon requires specific planetary hours for creating talismans, and the system is so central that ignoring it would be considered a fundamental error.

In Wicca and Witchcraft, planetary hours enhance spell timing. Many witches use them alongside moon phases to find optimal windows for candle magic, herb work, and ritual. The day correspondences (Tuesday = protection, Friday = love) are planetary hours in their simplest form.

In Hoodoo and Rootwork, timing work to the right day and hour is considered essential for effectiveness. Setting lights (candle work) on the correct planetary day is standard practice, and experienced root workers plan elaborate operations around planetary hour schedules.

In Alchemy, metal operations are timed to the planetary hours and days — lead work in Saturn hours, gold work in Sun hours. The correspondence between planets and metals is one of the oldest in Western esotericism.

A Note on the Astronomy

Planetary hours are a traditional system, not a modern scientific claim. The "planets" in this system include the Sun and Moon (which are a star and a satellite, not planets) because the ancients classified them with the five visible planets. The system also doesn't include Uranus, Neptune, or Pluto, which weren't visible to the naked eye.

That said, the underlying calculations are real astronomy. Sunrise and sunset times are precise, the planetary order reflects actual orbital speeds as observed from Earth, and the day-name correspondences are historically documented across dozens of cultures. The system is internally consistent and has been in continuous use for over 2,000 years — which is more than most timing systems can claim.