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 Tuesday, 23 September 2025: day of Mars
- Sunrise
- 07:03
- Sunset
- 19:10
- Next sunrise
- 07:04
A day hour lasts 1h 01m; a night hour, 1h 00m. Local time (Europe/Rome).
Day
- 1♂︎ Mars07:03 – 08:03
- 2☉︎ Sun08:03 – 09:04
- 3♀︎ Venus09:04 – 10:04
- 4☿︎ Mercury10:04 – 11:05
- 5☽︎ Moon11:05 – 12:05
- 6♄︎ Saturn12:05 – 13:06
- 7♃︎ Jupiter13:06 – 14:07
- 8♂︎ Mars14:07 – 15:07
- 9☉︎ Sun15:07 – 16:08
- 10♀︎ Venus16:08 – 17:08
- 11☿︎ Mercury17:08 – 18:09
- 12☽︎ Moon18:09 – 19:10
Night
- 1♄︎ Saturn19:10 – 20:09
- 2♃︎ Jupiter20:09 – 21:09
- 3♂︎ Mars21:09 – 22:08
- 4☉︎ Sun22:08 – 23:08
- 5♀︎ Venus23:08 – 00:07
- 6☿︎ Mercury00:07 – 01:07
- 7☽︎ Moon01:07 – 02:06
- 8♄︎ Saturn02:06 – 03:06
- 9♃︎ Jupiter03:06 – 04:05
- 10♂︎ Mars04:05 – 05:05
- 11☉︎ Sun05:05 – 06:04
- 12♀︎ Venus06:04 – 07:04
Questions
How are the planetary hours calculated in Bologna?
On Tuesday, 23 September 2025, the Sun rises at 07:03 and sets at 19:10: the day lasts 12h 07m, that is twelve day hours of 1h 01m. The night, until the next sunrise at 07:04, lasts 11h 54m: twelve night hours of 1h 00m.
Which planet rules the first hour that day?
Mars, from 07:03 to 08:03: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: the Sun, Venus, Mercury, the Moon, Saturn, Jupiter, then Mars 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.