Planetary hours
in Cardiff.
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 Tuesday, 16 December 2025: day of Mars
- Sunrise
- 08:12
- Sunset
- 16:04
- Next sunrise
- 08:13
A day hour lasts 39 min; a night hour, 1h 21m. Local time (Europe/London).
Day
- 1♂︎ Mars08:12 – 08:51
- 2☉︎ Sun08:51 – 09:31
- 3♀︎ Venus09:31 – 10:10
- 4☿︎ Mercury10:10 – 10:49
- 5☽︎ Moon10:49 – 11:29
- 6♄︎ Saturn11:29 – 12:08
- 7♃︎ Jupiter12:08 – 12:47
- 8♂︎ Mars12:47 – 13:26
- 9☉︎ Sun13:26 – 14:06
- 10♀︎ Venus14:06 – 14:45
- 11☿︎ Mercury14:45 – 15:24
- 12☽︎ Moon15:24 – 16:04
Night
- 1♄︎ Saturn16:04 – 17:24
- 2♃︎ Jupiter17:24 – 18:45
- 3♂︎ Mars18:45 – 20:06
- 4☉︎ Sun20:06 – 21:27
- 5♀︎ Venus21:27 – 22:47
- 6☿︎ Mercury22:47 – 00:08
- 7☽︎ Moon00:08 – 01:29
- 8♄︎ Saturn01:29 – 02:50
- 9♃︎ Jupiter02:50 – 04:11
- 10♂︎ Mars04:11 – 05:31
- 11☉︎ Sun05:31 – 06:52
- 12♀︎ Venus06:52 – 08:13
Other cities · United Kingdom
Questions
How are the planetary hours calculated in Cardiff?
On Tuesday, 16 December 2025, the Sun rises at 08:12 and sets at 16:04: the day lasts 7h 51m, that is twelve day hours of 39 min. The night, until the next sunrise at 08:13, lasts 16h 09m: twelve night hours of 1h 21m.
Which planet rules the first hour that day?
Mars, from 08:12 to 08:51: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: the Sun, Venus, Mercury, the Moon, Saturn, Jupiter, then Mars 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.