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, 18 October 2025: day of Saturn
- Sunrise
- 07:29
- Sunset
- 18:00
- Next sunrise
- 07:31
A day hour lasts 53 min; a night hour, 1h 08m. Local time (Europe/London).
Day
- 1♄︎ Saturn07:29 – 08:22
- 2♃︎ Jupiter08:22 – 09:14
- 3♂︎ Mars09:14 – 10:07
- 4☉︎ Sun10:07 – 11:00
- 5♀︎ Venus11:00 – 11:52
- 6☿︎ Mercury11:52 – 12:45
- 7☽︎ Moon12:45 – 13:37
- 8♄︎ Saturn13:37 – 14:30
- 9♃︎ Jupiter14:30 – 15:22
- 10♂︎ Mars15:22 – 16:15
- 11☉︎ Sun16:15 – 17:07
- 12♀︎ Venus17:07 – 18:00
Night
- 1☿︎ Mercury18:00 – 19:08
- 2☽︎ Moon19:08 – 20:15
- 3♄︎ Saturn20:15 – 21:23
- 4♃︎ Jupiter21:23 – 22:30
- 5♂︎ Mars22:30 – 23:38
- 6☉︎ Sun23:38 – 00:46
- 7♀︎ Venus00:46 – 01:53
- 8☿︎ Mercury01:53 – 03:01
- 9☽︎ Moon03:01 – 04:08
- 10♄︎ Saturn04:08 – 05:16
- 11♃︎ Jupiter05:16 – 06:24
- 12♂︎ Mars06:24 – 07:31
Other cities · United Kingdom
Questions
How are the planetary hours calculated in London?
On Saturday, 18 October 2025, the Sun rises at 07:29 and sets at 18:00: the day lasts 10h 31m, that is twelve day hours of 53 min. The night, until the next sunrise at 07:31, lasts 13h 31m: twelve night hours of 1h 08m.
Which planet rules the first hour that day?
Saturn, from 07:29 to 08:22: 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.