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 Sunday, 20 December 2026: day of the Sun
- Sunrise
- 08:15
- Sunset
- 16:05
- Next sunrise
- 08:15
A day hour lasts 39 min; a night hour, 1h 21m. Local time (Europe/London).
Day
- 1☉︎ Sun08:15 – 08:54
- 2♀︎ Venus08:54 – 09:33
- 3☿︎ Mercury09:33 – 10:12
- 4☽︎ Moon10:12 – 10:51
- 5♄︎ Saturn10:51 – 11:31
- 6♃︎ Jupiter11:31 – 12:10
- 7♂︎ Mars12:10 – 12:49
- 8☉︎ Sun12:49 – 13:28
- 9♀︎ Venus13:28 – 14:07
- 10☿︎ Mercury14:07 – 14:46
- 11☽︎ Moon14:46 – 15:26
- 12♄︎ Saturn15:26 – 16:05
Night
- 1♃︎ Jupiter16:05 – 17:26
- 2♂︎ Mars17:26 – 18:47
- 3☉︎ Sun18:47 – 20:07
- 4♀︎ Venus20:07 – 21:28
- 5☿︎ Mercury21:28 – 22:49
- 6☽︎ Moon22:49 – 00:10
- 7♄︎ Saturn00:10 – 01:31
- 8♃︎ Jupiter01:31 – 02:52
- 9♂︎ Mars02:52 – 04:13
- 10☉︎ Sun04:13 – 05:34
- 11♀︎ Venus05:34 – 06:54
- 12☿︎ Mercury06:54 – 08:15
Other cities · United Kingdom
Questions
How are the planetary hours calculated in Cardiff?
On Sunday, 20 December 2026, the Sun rises at 08:15 and sets at 16:05: the day lasts 7h 50m, that is twelve day hours of 39 min. The night, until the next sunrise at 08:15, lasts 16h 10m: twelve night hours of 1h 21m.
Which planet rules the first hour that day?
The Sun, from 08:15 to 08:54: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Venus, Mercury, the Moon, Saturn, Jupiter, Mars, then the Sun 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.