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 Saturday, 13 December 2025: day of Saturn
- Sunrise
- 08:07
- Sunset
- 16:01
- Next sunrise
- 08:08
A day hour lasts 39 min; a night hour, 1h 21m. Local time (Europe/London).
Day
- 1♄︎ Saturn08:07 – 08:47
- 2♃︎ Jupiter08:47 – 09:26
- 3♂︎ Mars09:26 – 10:06
- 4☉︎ Sun10:06 – 10:45
- 5♀︎ Venus10:45 – 11:25
- 6☿︎ Mercury11:25 – 12:04
- 7☽︎ Moon12:04 – 12:44
- 8♄︎ Saturn12:44 – 13:23
- 9♃︎ Jupiter13:23 – 14:03
- 10♂︎ Mars14:03 – 14:42
- 11☉︎ Sun14:42 – 15:22
- 12♀︎ Venus15:22 – 16:01
Night
- 1☿︎ Mercury16:01 – 17:22
- 2☽︎ Moon17:22 – 18:42
- 3♄︎ Saturn18:42 – 20:03
- 4♃︎ Jupiter20:03 – 21:23
- 5♂︎ Mars21:23 – 22:44
- 6☉︎ Sun22:44 – 00:05
- 7♀︎ Venus00:05 – 01:25
- 8☿︎ Mercury01:25 – 02:46
- 9☽︎ Moon02:46 – 04:06
- 10♄︎ Saturn04:06 – 05:27
- 11♃︎ Jupiter05:27 – 06:48
- 12♂︎ Mars06:48 – 08:08
Other cities · United Kingdom
Questions
How are the planetary hours calculated in Bristol?
On Saturday, 13 December 2025, the Sun rises at 08:07 and sets at 16:01: the day lasts 7h 54m, that is twelve day hours of 39 min. The night, until the next sunrise at 08:08, lasts 16h 07m: twelve night hours of 1h 21m.
Which planet rules the first hour that day?
Saturn, from 08:07 to 08:47: 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.