THE CELESTIAL CLOCK
Planetary Hours Calculator
Find the rhythm of your day. Explore the planetary hours calculated from sunrise and sunset at your chosen location.
THE CELESTIAL CLOCK
Find the rhythm of your day.
Sunrise to sunset · Twenty-four planetary hours
THE CELESTIAL CLOCK
The rhythm of the sky, set to your corner of the world.
A DAY IN PLANETARY TIME
What Are Planetary Hours?
Planetary hours are an ancient time-keeping system that divides the day and night into 24 unequal segments, each ruled by one of the seven classical planets. Unlike clock hours, planetary hours are based on your local sunrise and sunset — meaning they change length with the seasons and vary by location. This system dates back to ancient Babylon and has been used for thousands of years in astrology, magic, and traditional medicine.
The Seven Classical Planets
Sun
Success, leadership, vitality
Moon
Intuition, dreams, emotions
Mars
Courage, action, competition
Mercury
Communication, travel, learning
Jupiter
Abundance, luck, expansion
Venus
Love, beauty, harmony
Saturn
Discipline, structure, protection
How Planetary Hours Work
- 1Sunrise to sunset is divided into 12 equal day hours
- 2Sunset to next sunrise is divided into 12 equal night hours
- 3Each hour is assigned a planet following the Chaldean order: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon (repeating)
- 4The first hourof each day is ruled by the day's planet — Sunday starts with Sun, Monday with Moon, etc.
How to Use Planetary Hours
- Ritual timing: Choose the planetary hour that matches your intention — Venus for love spells, Jupiter for abundance work
- Business decisions: Sign contracts during Mercury hours, launch projects during Jupiter hours
- Spellwork and magick: Align your workings with the ruling planet for maximum potency
- Daily planning: Schedule creative work during Venus hours, physical activity during Mars hours
- Meditation and prayer: Connect with planetary energies during their corresponding hours
Planetary Hours for Rituals and Spellwork
Many practitioners time their rituals to align with the right planetary hour. A love spellcast during a Venus hour on a Friday (Venus's day) is considered especially powerful. A protection ritual during a Saturn hour on Saturday adds the energy of boundaries and discipline. For manifestation, Jupiter hours on Thursday are ideal for attracting abundance and good fortune.
Why Are Planetary Hours Unequal?
Unlike modern 60-minute hours, planetary hours are "unequal" or "temporal" hours. In summer, when days are long, each day hour might last 75 minutes while night hours last only 45 minutes. In winter, this reverses. At the equinoxes, day and night hours are exactly 60 minutes each. This is why you need your exact location — planetary hours are always local.
“Planetary hours are the oldest timing system in Western occultism — and they work because they align your intention with the planet that governs it. A Venus hour love spell and a Mars hour love spell produce very different results.”
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