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 Wednesday, 12 August 2026: day of Mercury
- Sunrise
- 06:13
- Sunset
- 20:24
- Next sunrise
- 06:14
A day hour lasts 1h 11m; a night hour, 49 min. Local time (Europe/Rome).
Day
- 1☿︎ Mercury06:13 – 07:24
- 2☽︎ Moon07:24 – 08:35
- 3♄︎ Saturn08:35 – 09:46
- 4♃︎ Jupiter09:46 – 10:57
- 5♂︎ Mars10:57 – 12:08
- 6☉︎ Sun12:08 – 13:19
- 7♀︎ Venus13:19 – 14:30
- 8☿︎ Mercury14:30 – 15:41
- 9☽︎ Moon15:41 – 16:52
- 10♄︎ Saturn16:52 – 18:02
- 11♃︎ Jupiter18:02 – 19:13
- 12♂︎ Mars19:13 – 20:24
Night
- 1☉︎ Sun20:24 – 21:13
- 2♀︎ Venus21:13 – 22:03
- 3☿︎ Mercury22:03 – 22:52
- 4☽︎ Moon22:52 – 23:41
- 5♄︎ Saturn23:41 – 00:30
- 6♃︎ Jupiter00:30 – 01:19
- 7♂︎ Mars01:19 – 02:09
- 8☉︎ Sun02:09 – 02:58
- 9♀︎ Venus02:58 – 03:47
- 10☿︎ Mercury03:47 – 04:36
- 11☽︎ Moon04:36 – 05:25
- 12♄︎ Saturn05:25 – 06:14
Questions
How are the planetary hours calculated in Bologna?
On Wednesday, 12 August 2026, the Sun rises at 06:13 and sets at 20:24: the day lasts 14h 11m, that is twelve day hours of 1h 11m. The night, until the next sunrise at 06:14, lasts 9h 50m: twelve night hours of 49 min.
Which planet rules the first hour that day?
Mercury, from 06:13 to 07:24: 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.