Planetary hours
in Rome.
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 Wednesday, 17 December 2025: day of Mercury
- Sunrise
- 07:31
- Sunset
- 16:40
- Next sunrise
- 07:32
A day hour lasts 46 min; a night hour, 1h 14m. Local time (Europe/Rome).
Day
- 1☿︎ Mercury07:31 – 08:17
- 2☽︎ Moon08:17 – 09:03
- 3♄︎ Saturn09:03 – 09:49
- 4♃︎ Jupiter09:49 – 10:34
- 5♂︎ Mars10:34 – 11:20
- 6☉︎ Sun11:20 – 12:06
- 7♀︎ Venus12:06 – 12:51
- 8☿︎ Mercury12:51 – 13:37
- 9☽︎ Moon13:37 – 14:23
- 10♄︎ Saturn14:23 – 15:08
- 11♃︎ Jupiter15:08 – 15:54
- 12♂︎ Mars15:54 – 16:40
Night
- 1☉︎ Sun16:40 – 17:54
- 2♀︎ Venus17:54 – 19:08
- 3☿︎ Mercury19:08 – 20:23
- 4☽︎ Moon20:23 – 21:37
- 5♄︎ Saturn21:37 – 22:52
- 6♃︎ Jupiter22:52 – 00:06
- 7♂︎ Mars00:06 – 01:20
- 8☉︎ Sun01:20 – 02:35
- 9♀︎ Venus02:35 – 03:49
- 10☿︎ Mercury03:49 – 05:03
- 11☽︎ Moon05:03 – 06:18
- 12♄︎ Saturn06:18 – 07:32
Questions
How are the planetary hours calculated in Rome?
On Wednesday, 17 December 2025, the Sun rises at 07:31 and sets at 16:40: the day lasts 9h 08m, that is twelve day hours of 46 min. The night, until the next sunrise at 07:32, lasts 14h 52m: twelve night hours of 1h 14m.
Which planet rules the first hour that day?
Mercury, from 07:31 to 08:17: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: the Moon, Saturn, Jupiter, Mars, the Sun, Venus, then Mercury 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.