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 Sunday, 21 December 2025: day of the Sun
- Sunrise
- 08:03
- Sunset
- 15:53
- Next sunrise
- 08:04
A day hour lasts 39 min; a night hour, 1h 21m. Local time (Europe/London).
Day
- 1☉︎ Sun08:03 – 08:43
- 2♀︎ Venus08:43 – 09:22
- 3☿︎ Mercury09:22 – 10:01
- 4☽︎ Moon10:01 – 10:40
- 5♄︎ Saturn10:40 – 11:19
- 6♃︎ Jupiter11:19 – 11:58
- 7♂︎ Mars11:58 – 12:37
- 8☉︎ Sun12:37 – 13:16
- 9♀︎ Venus13:16 – 13:56
- 10☿︎ Mercury13:56 – 14:35
- 11☽︎ Moon14:35 – 15:14
- 12♄︎ Saturn15:14 – 15:53
Night
- 1♃︎ Jupiter15:53 – 17:14
- 2♂︎ Mars17:14 – 18:35
- 3☉︎ Sun18:35 – 19:56
- 4♀︎ Venus19:56 – 21:17
- 5☿︎ Mercury21:17 – 22:38
- 6☽︎ Moon22:38 – 23:58
- 7♄︎ Saturn23:58 – 01:19
- 8♃︎ Jupiter01:19 – 02:40
- 9♂︎ Mars02:40 – 04:01
- 10☉︎ Sun04:01 – 05:22
- 11♀︎ Venus05:22 – 06:43
- 12☿︎ Mercury06:43 – 08:04
Other cities · United Kingdom
Questions
How are the planetary hours calculated in London?
On Sunday, 21 December 2025, the Sun rises at 08:03 and sets at 15:53: the day lasts 7h 50m, that is twelve day hours of 39 min. The night, until the next sunrise at 08:04, lasts 16h 11m: twelve night hours of 1h 21m.
Which planet rules the first hour that day?
The Sun, from 08:03 to 08:43: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Venus, Mercury, the Moon, Saturn, Jupiter, Mars, then the Sun 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.