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, 30 September 2026: day of Mercury
- Sunrise
- 07:11
- Sunset
- 18:57
- Next sunrise
- 07:12
A day hour lasts 59 min; a night hour, 1h 01m. Local time (Europe/Rome).
Day
- 1☿︎ Mercury07:11 – 08:09
- 2☽︎ Moon08:09 – 09:08
- 3♄︎ Saturn09:08 – 10:07
- 4♃︎ Jupiter10:07 – 11:06
- 5♂︎ Mars11:06 – 12:05
- 6☉︎ Sun12:05 – 13:04
- 7♀︎ Venus13:04 – 14:03
- 8☿︎ Mercury14:03 – 15:01
- 9☽︎ Moon15:01 – 16:00
- 10♄︎ Saturn16:00 – 16:59
- 11♃︎ Jupiter16:59 – 17:58
- 12♂︎ Mars17:58 – 18:57
Night
- 1☉︎ Sun18:57 – 19:58
- 2♀︎ Venus19:58 – 20:59
- 3☿︎ Mercury20:59 – 22:01
- 4☽︎ Moon22:01 – 23:02
- 5♄︎ Saturn23:02 – 00:03
- 6♃︎ Jupiter00:03 – 01:04
- 7♂︎ Mars01:04 – 02:06
- 8☉︎ Sun02:06 – 03:07
- 9♀︎ Venus03:07 – 04:08
- 10☿︎ Mercury04:08 – 05:09
- 11☽︎ Moon05:09 – 06:11
- 12♄︎ Saturn06:11 – 07:12
Questions
How are the planetary hours calculated in Bologna?
On Wednesday, 30 September 2026, the Sun rises at 07:11 and sets at 18:57: the day lasts 11h 46m, that is twelve day hours of 59 min. The night, until the next sunrise at 07:12, lasts 12h 15m: twelve night hours of 1h 01m.
Which planet rules the first hour that day?
Mercury, from 07:11 to 08:09: 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.