Planetary hours
in Florence.
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, 21 December 2025: day of the Sun
- Sunrise
- 07:45
- Sunset
- 16:40
- Next sunrise
- 07:46
A day hour lasts 45 min; a night hour, 1h 15m. Local time (Europe/Rome).
Day
- 1☉︎ Sun07:45 – 08:30
- 2♀︎ Venus08:30 – 09:14
- 3☿︎ Mercury09:14 – 09:59
- 4☽︎ Moon09:59 – 10:44
- 5♄︎ Saturn10:44 – 11:28
- 6♃︎ Jupiter11:28 – 12:13
- 7♂︎ Mars12:13 – 12:57
- 8☉︎ Sun12:57 – 13:42
- 9♀︎ Venus13:42 – 14:26
- 10☿︎ Mercury14:26 – 15:11
- 11☽︎ Moon15:11 – 15:56
- 12♄︎ Saturn15:56 – 16:40
Night
- 1♃︎ Jupiter16:40 – 17:56
- 2♂︎ Mars17:56 – 19:11
- 3☉︎ Sun19:11 – 20:27
- 4♀︎ Venus20:27 – 21:42
- 5☿︎ Mercury21:42 – 22:57
- 6☽︎ Moon22:57 – 00:13
- 7♄︎ Saturn00:13 – 01:28
- 8♃︎ Jupiter01:28 – 02:44
- 9♂︎ Mars02:44 – 03:59
- 10☉︎ Sun03:59 – 05:15
- 11♀︎ Venus05:15 – 06:30
- 12☿︎ Mercury06:30 – 07:46
Questions
How are the planetary hours calculated in Florence?
On Sunday, 21 December 2025, the Sun rises at 07:45 and sets at 16:40: the day lasts 8h 55m, that is twelve day hours of 45 min. The night, until the next sunrise at 07:46, lasts 15h 06m: twelve night hours of 1h 15m.
Which planet rules the first hour that day?
The Sun, from 07:45 to 08:30: 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.