Planetary hours
in Nantes.
The day, from sunrise to sunset, is cut into twelve equal hours; so is the night, from sunset to the next sunrise. Each hour carries a planet, in the Chaldean order. A planetary hour therefore lasts 60 minutes only at the equinoxes: it all depends on the date and the city. Here are the exact hours for your city; what you do with them is up to you.
Planetary day of Sunday, 21 December 2025: day of the Sun
- Sunrise
- 08:50
- Sunset
- 17:18
- Next sunrise
- 08:50
A day hour lasts 42 min; a night hour, 1h 18m. Local time (Europe/Paris).
Day
- 1☉︎ Sun08:50 – 09:32
- 2♀︎ Venus09:32 – 10:14
- 3☿︎ Mercury10:14 – 10:57
- 4☽︎ Moon10:57 – 11:39
- 5♄︎ Saturn11:39 – 12:21
- 6♃︎ Jupiter12:21 – 13:04
- 7♂︎ Mars13:04 – 13:46
- 8☉︎ Sun13:46 – 14:29
- 9♀︎ Venus14:29 – 15:11
- 10☿︎ Mercury15:11 – 15:53
- 11☽︎ Moon15:53 – 16:36
- 12♄︎ Saturn16:36 – 17:18
Night
- 1♃︎ Jupiter17:18 – 18:36
- 2♂︎ Mars18:36 – 19:54
- 3☉︎ Sun19:54 – 21:11
- 4♀︎ Venus21:11 – 22:29
- 5☿︎ Mercury22:29 – 23:46
- 6☽︎ Moon23:46 – 01:04
- 7♄︎ Saturn01:04 – 02:22
- 8♃︎ Jupiter02:22 – 03:39
- 9♂︎ Mars03:39 – 04:57
- 10☉︎ Sun04:57 – 06:15
- 11♀︎ Venus06:15 – 07:32
- 12☿︎ Mercury07:32 – 08:50
Other cities · France
Questions
How are the planetary hours calculated in Nantes?
On Sunday, 21 December 2025, the Sun rises at 08:50 and sets at 17:18: the day lasts 8h 29m, that is twelve day hours of 42 min. The night, until the next sunrise at 08:50, lasts 15h 32m: twelve night hours of 1h 18m.
Which planet rules the first hour that day?
The Sun, from 08:50 to 09:32: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Venus, Mercury, the Moon, Saturn, Jupiter, Mars, then the Sun again.
Today’s sky, on YOUR chart
Planetary hours are the same for everyone in a city. Your chart is yours alone: every morning AstroXP crosses the real sky with your birth, to the minute, and tells you what time it plays out for you.
On a computer? Scan this code with your phone.
Calendars
Sunrise and sunset calculated for the city (the Sun’s centre 0°50′ below the horizon: refraction and semi-diameter), local time of the city’s time zone. Checked against astronomy-engine, the app’s engine.