Planetary hours
in London.
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 Wednesday, 10 December 2025: day of Mercury
- Sunrise
- 07:55
- Sunset
- 15:51
- Next sunrise
- 07:56
A day hour lasts 40 min; a night hour, 1h 20m. Local time (Europe/London).
Day
- 1☿︎ Mercury07:55 – 08:34
- 2☽︎ Moon08:34 – 09:14
- 3♄︎ Saturn09:14 – 09:54
- 4♃︎ Jupiter09:54 – 10:33
- 5♂︎ Mars10:33 – 11:13
- 6☉︎ Sun11:13 – 11:53
- 7♀︎ Venus11:53 – 12:32
- 8☿︎ Mercury12:32 – 13:12
- 9☽︎ Moon13:12 – 13:52
- 10♄︎ Saturn13:52 – 14:32
- 11♃︎ Jupiter14:32 – 15:11
- 12♂︎ Mars15:11 – 15:51
Night
- 1☉︎ Sun15:51 – 17:11
- 2♀︎ Venus17:11 – 18:32
- 3☿︎ Mercury18:32 – 19:52
- 4☽︎ Moon19:52 – 21:13
- 5♄︎ Saturn21:13 – 22:33
- 6♃︎ Jupiter22:33 – 23:53
- 7♂︎ Mars23:53 – 01:14
- 8☉︎ Sun01:14 – 02:34
- 9♀︎ Venus02:34 – 03:54
- 10☿︎ Mercury03:54 – 05:15
- 11☽︎ Moon05:15 – 06:35
- 12♄︎ Saturn06:35 – 07:56
Other cities · United Kingdom
Questions
How are the planetary hours calculated in London?
On Wednesday, 10 December 2025, the Sun rises at 07:55 and sets at 15:51: the day lasts 7h 56m, that is twelve day hours of 40 min. The night, until the next sunrise at 07:56, lasts 16h 05m: twelve night hours of 1h 20m.
Which planet rules the first hour that day?
Mercury, from 07:55 to 08:34: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: the Moon, Saturn, Jupiter, Mars, the Sun, Venus, then Mercury 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.