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 Saturday, 20 December 2025: day of Saturn
- Sunrise
- 08:03
- Sunset
- 15:53
- Next sunrise
- 08:03
A day hour lasts 39 min; a night hour, 1h 21m. Local time (Europe/London).
Day
- 1♄︎ Saturn08:03 – 08:42
- 2♃︎ Jupiter08:42 – 09:21
- 3♂︎ Mars09:21 – 10:00
- 4☉︎ Sun10:00 – 10:39
- 5♀︎ Venus10:39 – 11:19
- 6☿︎ Mercury11:19 – 11:58
- 7☽︎ Moon11:58 – 12:37
- 8♄︎ Saturn12:37 – 13:16
- 9♃︎ Jupiter13:16 – 13:55
- 10♂︎ Mars13:55 – 14:34
- 11☉︎ Sun14:34 – 15:13
- 12♀︎ Venus15:13 – 15:53
Night
- 1☿︎ Mercury15:53 – 17:13
- 2☽︎ Moon17:13 – 18:34
- 3♄︎ Saturn18:34 – 19:55
- 4♃︎ Jupiter19:55 – 21:16
- 5♂︎ Mars21:16 – 22:37
- 6☉︎ Sun22:37 – 23:58
- 7♀︎ Venus23:58 – 01:19
- 8☿︎ Mercury01:19 – 02:40
- 9☽︎ Moon02:40 – 04:01
- 10♄︎ Saturn04:01 – 05:22
- 11♃︎ Jupiter05:22 – 06:42
- 12♂︎ Mars06:42 – 08:03
Other cities · United Kingdom
Questions
How are the planetary hours calculated in London?
On Saturday, 20 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 08:03, lasts 16h 11m: twelve night hours of 1h 21m.
Which planet rules the first hour that day?
Saturn, from 08:03 to 08:42: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Jupiter, Mars, the Sun, Venus, Mercury, the Moon, then Saturn 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.