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 Friday, 12 December 2025: day of Venus
- Sunrise
- 08:37
- Sunset
- 15:57
- Next sunrise
- 08:38
A day hour lasts 37 min; a night hour, 1h 23m. Local time (Europe/London).
Day
- 1♀︎ Venus08:37 – 09:13
- 2☿︎ Mercury09:13 – 09:50
- 3☽︎ Moon09:50 – 10:27
- 4♄︎ Saturn10:27 – 11:04
- 5♃︎ Jupiter11:04 – 11:40
- 6♂︎ Mars11:40 – 12:17
- 7☉︎ Sun12:17 – 12:54
- 8♀︎ Venus12:54 – 13:30
- 9☿︎ Mercury13:30 – 14:07
- 10☽︎ Moon14:07 – 14:44
- 11♄︎ Saturn14:44 – 15:20
- 12♃︎ Jupiter15:20 – 15:57
Night
- 1♂︎ Mars15:57 – 17:21
- 2☉︎ Sun17:21 – 18:44
- 3♀︎ Venus18:44 – 20:07
- 4☿︎ Mercury20:07 – 21:31
- 5☽︎ Moon21:31 – 22:54
- 6♄︎ Saturn22:54 – 00:17
- 7♃︎ Jupiter00:17 – 01:41
- 8♂︎ Mars01:41 – 03:04
- 9☉︎ Sun03:04 – 04:28
- 10♀︎ Venus04:28 – 05:51
- 11☿︎ Mercury05:51 – 07:14
- 12☽︎ Moon07:14 – 08:38
Other cities · United Kingdom
Questions
How are the planetary hours calculated in Belfast?
On Friday, 12 December 2025, the Sun rises at 08:37 and sets at 15:57: the day lasts 7h 20m, that is twelve day hours of 37 min. The night, until the next sunrise at 08:38, lasts 16h 41m: twelve night hours of 1h 23m.
Which planet rules the first hour that day?
Venus, from 08:37 to 09:13: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Mercury, the Moon, Saturn, Jupiter, Mars, the Sun, then Venus 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.