Planetary hours
in Rennes.
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 Tuesday, 16 December 2025: day of Mars
- Sunrise
- 08:51
- Sunset
- 17:13
- Next sunrise
- 08:51
A day hour lasts 42 min; a night hour, 1h 18m. Local time (Europe/Paris).
Day
- 1♂︎ Mars08:51 – 09:32
- 2☉︎ Sun09:32 – 10:14
- 3♀︎ Venus10:14 – 10:56
- 4☿︎ Mercury10:56 – 11:38
- 5☽︎ Moon11:38 – 12:20
- 6♄︎ Saturn12:20 – 13:02
- 7♃︎ Jupiter13:02 – 13:44
- 8♂︎ Mars13:44 – 14:26
- 9☉︎ Sun14:26 – 15:07
- 10♀︎ Venus15:07 – 15:49
- 11☿︎ Mercury15:49 – 16:31
- 12☽︎ Moon16:31 – 17:13
Night
- 1♄︎ Saturn17:13 – 18:31
- 2♃︎ Jupiter18:31 – 19:49
- 3♂︎ Mars19:49 – 21:08
- 4☉︎ Sun21:08 – 22:26
- 5♀︎ Venus22:26 – 23:44
- 6☿︎ Mercury23:44 – 01:02
- 7☽︎ Moon01:02 – 02:20
- 8♄︎ Saturn02:20 – 03:39
- 9♃︎ Jupiter03:39 – 04:57
- 10♂︎ Mars04:57 – 06:15
- 11☉︎ Sun06:15 – 07:33
- 12♀︎ Venus07:33 – 08:51
Other cities · France
Questions
How are the planetary hours calculated in Rennes?
On Tuesday, 16 December 2025, the Sun rises at 08:51 and sets at 17:13: the day lasts 8h 23m, that is twelve day hours of 42 min. The night, until the next sunrise at 08:51, lasts 15h 38m: twelve night hours of 1h 18m.
Which planet rules the first hour that day?
Mars, from 08:51 to 09:32: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: the Sun, Venus, Mercury, the Moon, Saturn, Jupiter, then Mars 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.