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 September 2025: day of Mars
- Sunrise
- 07:17
- Sunset
- 19:45
- Next sunrise
- 07:18
A day hour lasts 1h 02m; a night hour, 58 min. Local time (Europe/Paris).
Day
- 1♂︎ Mars07:17 – 08:19
- 2☉︎ Sun08:19 – 09:21
- 3♀︎ Venus09:21 – 10:24
- 4☿︎ Mercury10:24 – 11:26
- 5☽︎ Moon11:26 – 12:29
- 6♄︎ Saturn12:29 – 13:31
- 7♃︎ Jupiter13:31 – 14:33
- 8♂︎ Mars14:33 – 15:36
- 9☉︎ Sun15:36 – 16:38
- 10♀︎ Venus16:38 – 17:41
- 11☿︎ Mercury17:41 – 18:43
- 12☽︎ Moon18:43 – 19:45
Night
- 1♄︎ Saturn19:45 – 20:43
- 2♃︎ Jupiter20:43 – 21:41
- 3♂︎ Mars21:41 – 22:39
- 4☉︎ Sun22:39 – 23:36
- 5♀︎ Venus23:36 – 00:34
- 6☿︎ Mercury00:34 – 01:32
- 7☽︎ Moon01:32 – 02:29
- 8♄︎ Saturn02:29 – 03:27
- 9♃︎ Jupiter03:27 – 04:25
- 10♂︎ Mars04:25 – 05:22
- 11☉︎ Sun05:22 – 06:20
- 12♀︎ Venus06:20 – 07:18
Other cities · France
Questions
How are the planetary hours calculated in Grenoble?
On Tuesday, 16 September 2025, the Sun rises at 07:17 and sets at 19:45: the day lasts 12h 29m, that is twelve day hours of 1h 02m. The night, until the next sunrise at 07:18, lasts 11h 32m: twelve night hours of 58 min.
Which planet rules the first hour that day?
Mars, from 07:17 to 08:19: 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.