Planetary hours
in Bristol.
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, 17 December 2025: day of Mercury
- Sunrise
- 08:11
- Sunset
- 16:02
- Next sunrise
- 08:11
A day hour lasts 39 min; a night hour, 1h 21m. Local time (Europe/London).
Day
- 1☿︎ Mercury08:11 – 08:50
- 2☽︎ Moon08:50 – 09:29
- 3♄︎ Saturn09:29 – 10:08
- 4♃︎ Jupiter10:08 – 10:48
- 5♂︎ Mars10:48 – 11:27
- 6☉︎ Sun11:27 – 12:06
- 7♀︎ Venus12:06 – 12:45
- 8☿︎ Mercury12:45 – 13:25
- 9☽︎ Moon13:25 – 14:04
- 10♄︎ Saturn14:04 – 14:43
- 11♃︎ Jupiter14:43 – 15:22
- 12♂︎ Mars15:22 – 16:02
Night
- 1☉︎ Sun16:02 – 17:22
- 2♀︎ Venus17:22 – 18:43
- 3☿︎ Mercury18:43 – 20:04
- 4☽︎ Moon20:04 – 21:25
- 5♄︎ Saturn21:25 – 22:46
- 6♃︎ Jupiter22:46 – 00:06
- 7♂︎ Mars00:06 – 01:27
- 8☉︎ Sun01:27 – 02:48
- 9♀︎ Venus02:48 – 04:09
- 10☿︎ Mercury04:09 – 05:30
- 11☽︎ Moon05:30 – 06:50
- 12♄︎ Saturn06:50 – 08:11
Other cities · United Kingdom
Questions
How are the planetary hours calculated in Bristol?
On Wednesday, 17 December 2025, the Sun rises at 08:11 and sets at 16:02: the day lasts 7h 51m, that is twelve day hours of 39 min. The night, until the next sunrise at 08:11, lasts 16h 10m: twelve night hours of 1h 21m.
Which planet rules the first hour that day?
Mercury, from 08:11 to 08:50: 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.