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, 24 December 2025: day of Mercury
- Sunrise
- 08:05
- Sunset
- 15:55
- Next sunrise
- 08:05
A day hour lasts 39 min; a night hour, 1h 21m. Local time (Europe/London).
Day
- 1☿︎ Mercury08:05 – 08:44
- 2☽︎ Moon08:44 – 09:23
- 3♄︎ Saturn09:23 – 10:02
- 4♃︎ Jupiter10:02 – 10:41
- 5♂︎ Mars10:41 – 11:21
- 6☉︎ Sun11:21 – 12:00
- 7♀︎ Venus12:00 – 12:39
- 8☿︎ Mercury12:39 – 13:18
- 9☽︎ Moon13:18 – 13:57
- 10♄︎ Saturn13:57 – 14:36
- 11♃︎ Jupiter14:36 – 15:16
- 12♂︎ Mars15:16 – 15:55
Night
- 1☉︎ Sun15:55 – 17:16
- 2♀︎ Venus17:16 – 18:36
- 3☿︎ Mercury18:36 – 19:57
- 4☽︎ Moon19:57 – 21:18
- 5♄︎ Saturn21:18 – 22:39
- 6♃︎ Jupiter22:39 – 00:00
- 7♂︎ Mars00:00 – 01:21
- 8☉︎ Sun01:21 – 02:42
- 9♀︎ Venus02:42 – 04:02
- 10☿︎ Mercury04:02 – 05:23
- 11☽︎ Moon05:23 – 06:44
- 12♄︎ Saturn06:44 – 08:05
Other cities · United Kingdom
Questions
How are the planetary hours calculated in London?
On Wednesday, 24 December 2025, the Sun rises at 08:05 and sets at 15:55: the day lasts 7h 50m, that is twelve day hours of 39 min. The night, until the next sunrise at 08:05, lasts 16h 10m: twelve night hours of 1h 21m.
Which planet rules the first hour that day?
Mercury, from 08:05 to 08:44: 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.