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 Wednesday, 12 August 2026: day of Mercury
- Sunrise
- 05:41
- Sunset
- 20:28
- Next sunrise
- 05:42
A day hour lasts 1h 14m; a night hour, 46 min. Local time (Europe/London).
Day
- 1☿︎ Mercury05:41 – 06:55
- 2☽︎ Moon06:55 – 08:09
- 3♄︎ Saturn08:09 – 09:23
- 4♃︎ Jupiter09:23 – 10:37
- 5♂︎ Mars10:37 – 11:51
- 6☉︎ Sun11:51 – 13:05
- 7♀︎ Venus13:05 – 14:19
- 8☿︎ Mercury14:19 – 15:32
- 9☽︎ Moon15:32 – 16:46
- 10♄︎ Saturn16:46 – 18:00
- 11♃︎ Jupiter18:00 – 19:14
- 12♂︎ Mars19:14 – 20:28
Night
- 1☉︎ Sun20:28 – 21:15
- 2♀︎ Venus21:15 – 22:01
- 3☿︎ Mercury22:01 – 22:47
- 4☽︎ Moon22:47 – 23:33
- 5♄︎ Saturn23:33 – 00:19
- 6♃︎ Jupiter00:19 – 01:05
- 7♂︎ Mars01:05 – 01:51
- 8☉︎ Sun01:51 – 02:38
- 9♀︎ Venus02:38 – 03:24
- 10☿︎ Mercury03:24 – 04:10
- 11☽︎ Moon04:10 – 04:56
- 12♄︎ Saturn04:56 – 05:42
Other cities · United Kingdom
Questions
How are the planetary hours calculated in London?
On Wednesday, 12 August 2026, the Sun rises at 05:41 and sets at 20:28: the day lasts 14h 48m, that is twelve day hours of 1h 14m. The night, until the next sunrise at 05:42, lasts 9h 14m: twelve night hours of 46 min.
Which planet rules the first hour that day?
Mercury, from 05:41 to 06:55: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: the Moon, Saturn, Jupiter, Mars, the Sun, Venus, then Mercury 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.