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 Saturday, 13 December 2025: day of Saturn
- Sunrise
- 08:10
- Sunset
- 16:03
- Next sunrise
- 08:11
A day hour lasts 39 min; a night hour, 1h 21m. Local time (Europe/London).
Day
- 1♄︎ Saturn08:10 – 08:49
- 2♃︎ Jupiter08:49 – 09:29
- 3♂︎ Mars09:29 – 10:08
- 4☉︎ Sun10:08 – 10:48
- 5♀︎ Venus10:48 – 11:27
- 6☿︎ Mercury11:27 – 12:06
- 7☽︎ Moon12:06 – 12:46
- 8♄︎ Saturn12:46 – 13:25
- 9♃︎ Jupiter13:25 – 14:05
- 10♂︎ Mars14:05 – 14:44
- 11☉︎ Sun14:44 – 15:24
- 12♀︎ Venus15:24 – 16:03
Night
- 1☿︎ Mercury16:03 – 17:24
- 2☽︎ Moon17:24 – 18:44
- 3♄︎ Saturn18:44 – 20:05
- 4♃︎ Jupiter20:05 – 21:26
- 5♂︎ Mars21:26 – 22:46
- 6☉︎ Sun22:46 – 00:07
- 7♀︎ Venus00:07 – 01:27
- 8☿︎ Mercury01:27 – 02:48
- 9☽︎ Moon02:48 – 04:09
- 10♄︎ Saturn04:09 – 05:29
- 11♃︎ Jupiter05:29 – 06:50
- 12♂︎ Mars06:50 – 08:11
Other cities · United Kingdom
Questions
How are the planetary hours calculated in Cardiff?
On Saturday, 13 December 2025, the Sun rises at 08:10 and sets at 16:03: the day lasts 7h 54m, that is twelve day hours of 39 min. The night, until the next sunrise at 08:11, lasts 16h 07m: twelve night hours of 1h 21m.
Which planet rules the first hour that day?
Saturn, from 08:10 to 08:49: 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.