Planetary hours
in Bologna.
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 Thursday, 21 May 2026: day of Jupiter
- Sunrise
- 05:41
- Sunset
- 20:41
- Next sunrise
- 05:40
A day hour lasts 1h 15m; a night hour, 45 min. Local time (Europe/Rome).
Day
- 1♃︎ Jupiter05:41 – 06:56
- 2♂︎ Mars06:56 – 08:11
- 3☉︎ Sun08:11 – 09:26
- 4♀︎ Venus09:26 – 10:41
- 5☿︎ Mercury10:41 – 11:56
- 6☽︎ Moon11:56 – 13:11
- 7♄︎ Saturn13:11 – 14:26
- 8♃︎ Jupiter14:26 – 15:41
- 9♂︎ Mars15:41 – 16:56
- 10☉︎ Sun16:56 – 18:11
- 11♀︎ Venus18:11 – 19:26
- 12☿︎ Mercury19:26 – 20:41
Night
- 1☽︎ Moon20:41 – 21:26
- 2♄︎ Saturn21:26 – 22:11
- 3♃︎ Jupiter22:11 – 22:56
- 4♂︎ Mars22:56 – 23:41
- 5☉︎ Sun23:41 – 00:26
- 6♀︎ Venus00:26 – 01:11
- 7☿︎ Mercury01:11 – 01:55
- 8☽︎ Moon01:55 – 02:40
- 9♄︎ Saturn02:40 – 03:25
- 10♃︎ Jupiter03:25 – 04:10
- 11♂︎ Mars04:10 – 04:55
- 12☉︎ Sun04:55 – 05:40
Questions
How are the planetary hours calculated in Bologna?
On Thursday, 21 May 2026, the Sun rises at 05:41 and sets at 20:41: the day lasts 15h 01m, that is twelve day hours of 1h 15m. The night, until the next sunrise at 05:40, lasts 8h 58m: twelve night hours of 45 min.
Which planet rules the first hour that day?
Jupiter, from 05:41 to 06:56: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Mars, the Sun, Venus, Mercury, the Moon, Saturn, then Jupiter 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.