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📘 About the Planetary Hours
Medieval astrologers, physicians and magicians divided the time from sunrise to sunset, and from sunset to the next sunrise, into 12 unequal 'planetary hours' each. Every hour is ruled by one of the seven classical planets.
The first hour after sunrise belongs to the planet that names the day — the Sun on Sunday, the Moon on Monday, Mars on Tuesday and so on — and the rest follow the Chaldean order: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon. Pick a date and place to see all 24 hours.
✏️ Worked example
14 Oct 2026, New Delhi
You get| Day ruler | ☿ Mercury — Wednesday is the day of Mercury |
| Sunrise / sunset | 6:21 am / 5:53 pm (New Delhi) |
| Length of each hour | Day hours 58 min · night hours 62 min |
6:21 am / 5:53 pm (New Delhi); sunrise/sunset Day hours 58 min · night hours 62 min.
Try this example →🧭 How to use this calculator
What you enter
- Date
- Place
- Daylight saving (summer time) in effect?
- Latitude (other place only) (°)North +, south −. e.g. 26.85 for Lucknow
- Longitude (other place only) (°)East +, west −. e.g. 80.95 for Lucknow
- UTC offset (other place only) (hours)e.g. 5.5 for India
What you get
- Planetary hour now
- Day ruler
- Sunrise / sunset
- Length of each hour
❓ Frequently asked questions
Why are planetary hours not 60 minutes?
Because daylight is split into 12 equal parts whatever its length — long hours in summer, short in winter.
Why is Tuesday the day of Mars?
Its first planetary hour is ruled by Mars; the weekday names in many languages (mardi, martes, Mangalvar) come from the same system.
What is the Chaldean order?
The seven classical planets from slowest to fastest: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon.
Is this scientific?
No. Astrology has no scientific support; these tools reproduce historical medieval methods for interest and entertainment.
What people are saying
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Anonymous · 14 Oct 2026