Planetary hours
in Grenoble.
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
- 08:09
- Sunset
- 16:55
- Next sunrise
- 08:10
A day hour lasts 44 min; a night hour, 1h 16m. Local time (Europe/Paris).
Day
- 1♂︎ Mars08:09 – 08:53
- 2☉︎ Sun08:53 – 09:37
- 3♀︎ Venus09:37 – 10:21
- 4☿︎ Mercury10:21 – 11:05
- 5☽︎ Moon11:05 – 11:49
- 6♄︎ Saturn11:49 – 12:32
- 7♃︎ Jupiter12:32 – 13:16
- 8♂︎ Mars13:16 – 14:00
- 9☉︎ Sun14:00 – 14:44
- 10♀︎ Venus14:44 – 15:28
- 11☿︎ Mercury15:28 – 16:11
- 12☽︎ Moon16:11 – 16:55
Night
- 1♄︎ Saturn16:55 – 18:11
- 2♃︎ Jupiter18:11 – 19:28
- 3♂︎ Mars19:28 – 20:44
- 4☉︎ Sun20:44 – 22:00
- 5♀︎ Venus22:00 – 23:16
- 6☿︎ Mercury23:16 – 00:33
- 7☽︎ Moon00:33 – 01:49
- 8♄︎ Saturn01:49 – 03:05
- 9♃︎ Jupiter03:05 – 04:21
- 10♂︎ Mars04:21 – 05:38
- 11☉︎ Sun05:38 – 06:54
- 12♀︎ Venus06:54 – 08:10
Other cities · France
Questions
How are the planetary hours calculated in Grenoble?
On Tuesday, 16 December 2025, the Sun rises at 08:09 and sets at 16:55: the day lasts 8h 46m, that is twelve day hours of 44 min. The night, until the next sunrise at 08:10, lasts 15h 15m: twelve night hours of 1h 16m.
Which planet rules the first hour that day?
Mars, from 08:09 to 08:53: 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.