Location-aware • Seasonal hours • Clear & fast
Planetary Hours Calculator
Calculate planetary hours for any city, time zone, and date — based on local sunrise/sunset, with clear day & night hours.
- Enter a city (or coordinates for precision).
- Choose a date and timezone.
- Open the calculator and see today’s hours + advanced Moon & houses.
What are planetary hours?
Planetary hours are a traditional timing system used in astrology and ritual practice. They divide day and night into 24 seasonal hours (12 by day, 12 by night).
Each hour is ruled by a planet. The rulership follows the Chaldean order and starts from the planet that rules the weekday.
- ✓ Hours depend on your location.
- ✓ They change with sunrise/sunset.
- ✓ Day & night are split into 12 + 12.
- ✓ Rulers follow Chaldean order.
How it works (in plain terms)
1) Location → sunrise & sunset
Choose a location (city or coordinates) and a date. We compute sunrise and sunset for that place, accounting for local timezone and daylight saving time.
2) Seasonal hours (unequal)
Daytime is split into 12 seasonal hours from sunrise to sunset; night is split into 12 seasonal hours from sunset to sunrise. Hour lengths change with the season.
3) Planet rulers (Chaldean order)
Each hour is ruled by a planet in Chaldean order. The first hour of each day starts with the planet that rules that weekday (e.g., Sun on Sunday, Moon on Monday).
After you open the main app, you can explore extra layers (Moon data, houses, search filters, election-style windows) without cluttering this landing page.
Open the calculator →Practical use cases (non-fluffy)
Planetary hours are a timing layer. You can use them to align actions with traditional planetary qualities — like choosing a Venus hour for relationships or art, or a Mercury hour for study and deals.
Love, beauty, harmony
Pick a Venus hour for meetings, art, beauty, reconciliation, and social harmony. Great for actions that need attraction and ease.
Learning, commerce, communication
Use Mercury hours for writing, study, interviews, commerce, tech work, and travel logistics. Ideal for fast iteration and clear messaging.
Action, courage, momentum
Mars hours can support courage, competition, workouts, and cutting through obstacles. Best used with a clear plan (and not for impulsive drama).
Don’t use hours in isolation. Strong timing usually combines planetary hour + Moon condition + aspects + house strength. The Election tab helps you scan for stronger windows.
Planet Cheat Sheet (Traditional Associations)
Use this as a quick guide when you’re choosing a planet for an action window. Always confirm the chart context (Moon, aspects, and house condition).
| Planet | Keywords | Good for |
|---|---|---|
| ☉ Sun | Vitality, clarity, confidence | Leadership, visibility, important decisions |
| ☾ Moon | Emotions, body, rhythm | Home, care, intuition, daily routines |
| ☿ Mercury | Communication, trade, learning | Messaging, deals, study, travel |
| ♀ Venus | Attraction, pleasure, connection | Love, art, harmony, money flow |
| ♂ Mars | Action, force, drive | Courage, competition, cutting ties |
| ♃ Jupiter | Expansion, luck, teaching | Growth, opportunity, long-term gains |
| ♄ Saturn | Structure, limits, time | Discipline, boundaries, endings |
FAQ
What are planetary hours?
Planetary hours divide the day and night into 24 unequal seasonal hours. Each hour is ruled by a planet in Chaldean order, starting from the planet that rules the weekday.
Do planetary hours depend on location?
No. Planetary hours depend on local sunrise and sunset. The exact start/end times change by city, season, and daylight saving time.
What is Chaldean order?
Traditional systems use Chaldean order: Saturn → Jupiter → Mars → Sun → Venus → Mercury → Moon, repeating. The first hour of each day starts with the weekday’s ruler.
How do people use planetary hours?
Yes. Many practitioners choose hours that match the goal (e.g., Venus for love/art, Mercury for learning/commerce). Strong charts also consider Moon condition, aspects, and house placement.
What does this site calculate?
The calculator shows today’s planetary hours, plus advanced Moon data and Placidus houses. The Election tab finds strong time windows for a chosen intention.
Why are these called “seasonal” hours?
Seasonal hours are unequal: daytime is split into 12 parts from sunrise to sunset, and night into 12 parts from sunset to sunrise. Hours are longer in summer days and shorter in winter days.
Do I need coordinates or is a city enough?
Use your city/timezone for convenience. For maximum precision (especially near borders or unusual DST rules), you can enter coordinates.
Is this free and mobile-friendly?
Yes. The app is built to be fast and mobile-friendly, with caching and minimal UI friction.