Planetary hours
in Belfast.
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, 20 December 2025: day of Saturn
- Sunrise
- 08:43
- Sunset
- 15:58
- Next sunrise
- 08:44
A day hour lasts 36 min; a night hour, 1h 24m. Local time (Europe/London).
Day
- 1♄︎ Saturn08:43 – 09:20
- 2♃︎ Jupiter09:20 – 09:56
- 3♂︎ Mars09:56 – 10:32
- 4☉︎ Sun10:32 – 11:08
- 5♀︎ Venus11:08 – 11:45
- 6☿︎ Mercury11:45 – 12:21
- 7☽︎ Moon12:21 – 12:57
- 8♄︎ Saturn12:57 – 13:33
- 9♃︎ Jupiter13:33 – 14:10
- 10♂︎ Mars14:10 – 14:46
- 11☉︎ Sun14:46 – 15:22
- 12♀︎ Venus15:22 – 15:58
Night
- 1☿︎ Mercury15:58 – 17:22
- 2☽︎ Moon17:22 – 18:46
- 3♄︎ Saturn18:46 – 20:10
- 4♃︎ Jupiter20:10 – 21:34
- 5♂︎ Mars21:34 – 22:57
- 6☉︎ Sun22:57 – 00:21
- 7♀︎ Venus00:21 – 01:45
- 8☿︎ Mercury01:45 – 03:09
- 9☽︎ Moon03:09 – 04:33
- 10♄︎ Saturn04:33 – 05:56
- 11♃︎ Jupiter05:56 – 07:20
- 12♂︎ Mars07:20 – 08:44
Other cities · United Kingdom
Questions
How are the planetary hours calculated in Belfast?
On Saturday, 20 December 2025, the Sun rises at 08:43 and sets at 15:58: the day lasts 7h 15m, that is twelve day hours of 36 min. The night, until the next sunrise at 08:44, lasts 16h 45m: twelve night hours of 1h 24m.
Which planet rules the first hour that day?
Saturn, from 08:43 to 09:20: 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.