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 Thursday, 16 October 2025: day of Jupiter
- Sunrise
- 07:54
- Sunset
- 18:50
- Next sunrise
- 07:55
A day hour lasts 55 min; a night hour, 1h 05m. Local time (Europe/Paris).
Day
- 1♃︎ Jupiter07:54 – 08:49
- 2♂︎ Mars08:49 – 09:43
- 3☉︎ Sun09:43 – 10:38
- 4♀︎ Venus10:38 – 11:33
- 5☿︎ Mercury11:33 – 12:27
- 6☽︎ Moon12:27 – 13:22
- 7♄︎ Saturn13:22 – 14:16
- 8♃︎ Jupiter14:16 – 15:11
- 9♂︎ Mars15:11 – 16:06
- 10☉︎ Sun16:06 – 17:00
- 11♀︎ Venus17:00 – 17:55
- 12☿︎ Mercury17:55 – 18:50
Night
- 1☽︎ Moon18:50 – 19:55
- 2♄︎ Saturn19:55 – 21:01
- 3♃︎ Jupiter21:01 – 22:06
- 4♂︎ Mars22:06 – 23:12
- 5☉︎ Sun23:12 – 00:17
- 6♀︎ Venus00:17 – 01:22
- 7☿︎ Mercury01:22 – 02:28
- 8☽︎ Moon02:28 – 03:33
- 9♄︎ Saturn03:33 – 04:39
- 10♃︎ Jupiter04:39 – 05:44
- 11♂︎ Mars05:44 – 06:50
- 12☉︎ Sun06:50 – 07:55
Other cities · France
Questions
How are the planetary hours calculated in Grenoble?
On Thursday, 16 October 2025, the Sun rises at 07:54 and sets at 18:50: the day lasts 10h 56m, that is twelve day hours of 55 min. The night, until the next sunrise at 07:55, lasts 13h 06m: twelve night hours of 1h 05m.
Which planet rules the first hour that day?
Jupiter, from 07:54 to 08:49: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Mars, the Sun, Venus, Mercury, the Moon, Saturn, then Jupiter 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.