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 Thursday, 17 December 2026: day of Jupiter
- Sunrise
- 08:01
- Sunset
- 15:51
- Next sunrise
- 08:01
A day hour lasts 39 min; a night hour, 1h 21m. Local time (Europe/London).
Day
- 1♃︎ Jupiter08:01 – 08:40
- 2♂︎ Mars08:40 – 09:19
- 3☉︎ Sun09:19 – 09:58
- 4♀︎ Venus09:58 – 10:38
- 5☿︎ Mercury10:38 – 11:17
- 6☽︎ Moon11:17 – 11:56
- 7♄︎ Saturn11:56 – 12:35
- 8♃︎ Jupiter12:35 – 13:15
- 9♂︎ Mars13:15 – 13:54
- 10☉︎ Sun13:54 – 14:33
- 11♀︎ Venus14:33 – 15:12
- 12☿︎ Mercury15:12 – 15:51
Night
- 1☽︎ Moon15:51 – 17:12
- 2♄︎ Saturn17:12 – 18:33
- 3♃︎ Jupiter18:33 – 19:54
- 4♂︎ Mars19:54 – 21:15
- 5☉︎ Sun21:15 – 22:36
- 6♀︎ Venus22:36 – 23:56
- 7☿︎ Mercury23:56 – 01:17
- 8☽︎ Moon01:17 – 02:38
- 9♄︎ Saturn02:38 – 03:59
- 10♃︎ Jupiter03:59 – 05:20
- 11♂︎ Mars05:20 – 06:41
- 12☉︎ Sun06:41 – 08:01
Other cities · United Kingdom
Questions
How are the planetary hours calculated in London?
On Thursday, 17 December 2026, the Sun rises at 08:01 and sets at 15:51: the day lasts 7h 51m, that is twelve day hours of 39 min. The night, until the next sunrise at 08:01, lasts 16h 10m: twelve night hours of 1h 21m.
Which planet rules the first hour that day?
Jupiter, from 08:01 to 08:40: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Mars, the Sun, Venus, Mercury, the Moon, Saturn, then Jupiter 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.