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, 6 December 2025: day of Saturn
- Sunrise
- 07:50
- Sunset
- 15:52
- Next sunrise
- 07:51
A day hour lasts 40 min; a night hour, 1h 20m. Local time (Europe/London).
Day
- 1♄︎ Saturn07:50 – 08:30
- 2♃︎ Jupiter08:30 – 09:10
- 3♂︎ Mars09:10 – 09:51
- 4☉︎ Sun09:51 – 10:31
- 5♀︎ Venus10:31 – 11:11
- 6☿︎ Mercury11:11 – 11:51
- 7☽︎ Moon11:51 – 12:31
- 8♄︎ Saturn12:31 – 13:11
- 9♃︎ Jupiter13:11 – 13:51
- 10♂︎ Mars13:51 – 14:32
- 11☉︎ Sun14:32 – 15:12
- 12♀︎ Venus15:12 – 15:52
Night
- 1☿︎ Mercury15:52 – 17:12
- 2☽︎ Moon17:12 – 18:32
- 3♄︎ Saturn18:32 – 19:52
- 4♃︎ Jupiter19:52 – 21:12
- 5♂︎ Mars21:12 – 22:32
- 6☉︎ Sun22:32 – 23:52
- 7♀︎ Venus23:52 – 01:12
- 8☿︎ Mercury01:12 – 02:31
- 9☽︎ Moon02:31 – 03:51
- 10♄︎ Saturn03:51 – 05:11
- 11♃︎ Jupiter05:11 – 06:31
- 12♂︎ Mars06:31 – 07:51
Other cities · United Kingdom
Questions
How are the planetary hours calculated in London?
On Saturday, 6 December 2025, the Sun rises at 07:50 and sets at 15:52: the day lasts 8h 02m, that is twelve day hours of 40 min. The night, until the next sunrise at 07:51, lasts 15h 59m: twelve night hours of 1h 20m.
Which planet rules the first hour that day?
Saturn, from 07:50 to 08:30: 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.