Planetary hours
in Brest.
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
- 09:03
- Sunset
- 17:23
- Next sunrise
- 09:04
A day hour lasts 42 min; a night hour, 1h 18m. Local time (Europe/Paris).
Day
- 1♂︎ Mars09:03 – 09:45
- 2☉︎ Sun09:45 – 10:26
- 3♀︎ Venus10:26 – 11:08
- 4☿︎ Mercury11:08 – 11:50
- 5☽︎ Moon11:50 – 12:31
- 6♄︎ Saturn12:31 – 13:13
- 7♃︎ Jupiter13:13 – 13:55
- 8♂︎ Mars13:55 – 14:36
- 9☉︎ Sun14:36 – 15:18
- 10♀︎ Venus15:18 – 16:00
- 11☿︎ Mercury16:00 – 16:42
- 12☽︎ Moon16:42 – 17:23
Night
- 1♄︎ Saturn17:23 – 18:42
- 2♃︎ Jupiter18:42 – 20:00
- 3♂︎ Mars20:00 – 21:18
- 4☉︎ Sun21:18 – 22:37
- 5♀︎ Venus22:37 – 23:55
- 6☿︎ Mercury23:55 – 01:13
- 7☽︎ Moon01:13 – 02:32
- 8♄︎ Saturn02:32 – 03:50
- 9♃︎ Jupiter03:50 – 05:09
- 10♂︎ Mars05:09 – 06:27
- 11☉︎ Sun06:27 – 07:45
- 12♀︎ Venus07:45 – 09:04
Other cities · France
Questions
How are the planetary hours calculated in Brest?
On Tuesday, 16 December 2025, the Sun rises at 09:03 and sets at 17:23: the day lasts 8h 20m, that is twelve day hours of 42 min. The night, until the next sunrise at 09:04, lasts 15h 41m: twelve night hours of 1h 18m.
Which planet rules the first hour that day?
Mars, from 09:03 to 09:45: 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.