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, 16 September 2026: day of Mercury
- Sunrise
- 06:54
- Sunset
- 19:23
- Next sunrise
- 06:55
A day hour lasts 1h 02m; a night hour, 58 min. Local time (Europe/Rome).
Day
- 1☿︎ Mercury06:54 – 07:56
- 2☽︎ Moon07:56 – 08:59
- 3♄︎ Saturn08:59 – 10:01
- 4♃︎ Jupiter10:01 – 11:04
- 5♂︎ Mars11:04 – 12:06
- 6☉︎ Sun12:06 – 13:09
- 7♀︎ Venus13:09 – 14:11
- 8☿︎ Mercury14:11 – 15:13
- 9☽︎ Moon15:13 – 16:16
- 10♄︎ Saturn16:16 – 17:18
- 11♃︎ Jupiter17:18 – 18:21
- 12♂︎ Mars18:21 – 19:23
Night
- 1☉︎ Sun19:23 – 20:21
- 2♀︎ Venus20:21 – 21:19
- 3☿︎ Mercury21:19 – 22:16
- 4☽︎ Moon22:16 – 23:14
- 5♄︎ Saturn23:14 – 00:12
- 6♃︎ Jupiter00:12 – 01:09
- 7♂︎ Mars01:09 – 02:07
- 8☉︎ Sun02:07 – 03:05
- 9♀︎ Venus03:05 – 04:02
- 10☿︎ Mercury04:02 – 05:00
- 11☽︎ Moon05:00 – 05:58
- 12♄︎ Saturn05:58 – 06:55
Questions
How are the planetary hours calculated in Bologna?
On Wednesday, 16 September 2026, the Sun rises at 06:54 and sets at 19:23: the day lasts 12h 29m, that is twelve day hours of 1h 02m. The night, until the next sunrise at 06:55, lasts 11h 32m: twelve night hours of 58 min.
Which planet rules the first hour that day?
Mercury, from 06:54 to 07:56: 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.