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 Friday, 18 December 2026: day of Venus
- Sunrise
- 08:01
- Sunset
- 15:52
- Next sunrise
- 08:02
A day hour lasts 39 min; a night hour, 1h 21m. Local time (Europe/London).
Day
- 1♀︎ Venus08:01 – 08:41
- 2☿︎ Mercury08:41 – 09:20
- 3☽︎ Moon09:20 – 09:59
- 4♄︎ Saturn09:59 – 10:38
- 5♃︎ Jupiter10:38 – 11:17
- 6♂︎ Mars11:17 – 11:57
- 7☉︎ Sun11:57 – 12:36
- 8♀︎ Venus12:36 – 13:15
- 9☿︎ Mercury13:15 – 13:54
- 10☽︎ Moon13:54 – 14:33
- 11♄︎ Saturn14:33 – 15:13
- 12♃︎ Jupiter15:13 – 15:52
Night
- 1♂︎ Mars15:52 – 17:13
- 2☉︎ Sun17:13 – 18:33
- 3♀︎ Venus18:33 – 19:54
- 4☿︎ Mercury19:54 – 21:15
- 5☽︎ Moon21:15 – 22:36
- 6♄︎ Saturn22:36 – 23:57
- 7♃︎ Jupiter23:57 – 01:18
- 8♂︎ Mars01:18 – 02:39
- 9☉︎ Sun02:39 – 03:59
- 10♀︎ Venus03:59 – 05:20
- 11☿︎ Mercury05:20 – 06:41
- 12☽︎ Moon06:41 – 08:02
Other cities · United Kingdom
Questions
How are the planetary hours calculated in London?
On Friday, 18 December 2026, the Sun rises at 08:01 and sets at 15:52: the day lasts 7h 50m, that is twelve day hours of 39 min. The night, until the next sunrise at 08:02, lasts 16h 10m: twelve night hours of 1h 21m.
Which planet rules the first hour that day?
Venus, from 08:01 to 08:41: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Mercury, the Moon, Saturn, Jupiter, Mars, the Sun, then Venus 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.