Planetary hours
in Boulogne-Billancourt.
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, 21 October 2026: day of Mercury
- Sunrise
- 08:20
- Sunset
- 18:50
- Next sunrise
- 08:21
A day hour lasts 52 min; a night hour, 1h 08m. Local time (Europe/Paris).
Day
- 1☿︎ Mercury08:20 – 09:12
- 2☽︎ Moon09:12 – 10:05
- 3♄︎ Saturn10:05 – 10:57
- 4♃︎ Jupiter10:57 – 11:50
- 5♂︎ Mars11:50 – 12:42
- 6☉︎ Sun12:42 – 13:35
- 7♀︎ Venus13:35 – 14:27
- 8☿︎ Mercury14:27 – 15:20
- 9☽︎ Moon15:20 – 16:12
- 10♄︎ Saturn16:12 – 17:05
- 11♃︎ Jupiter17:05 – 17:57
- 12♂︎ Mars17:57 – 18:50
Night
- 1☉︎ Sun18:50 – 19:57
- 2♀︎ Venus19:57 – 21:05
- 3☿︎ Mercury21:05 – 22:13
- 4☽︎ Moon22:13 – 23:20
- 5♄︎ Saturn23:20 – 00:28
- 6♃︎ Jupiter00:28 – 01:36
- 7♂︎ Mars01:36 – 02:43
- 8☉︎ Sun02:43 – 03:51
- 9♀︎ Venus03:51 – 04:59
- 10☿︎ Mercury04:59 – 06:06
- 11☽︎ Moon06:06 – 07:14
- 12♄︎ Saturn07:14 – 08:21
Other cities · France
Questions
How are the planetary hours calculated in Boulogne-Billancourt?
On Wednesday, 21 October 2026, the Sun rises at 08:20 and sets at 18:50: the day lasts 10h 30m, that is twelve day hours of 52 min. The night, until the next sunrise at 08:21, lasts 13h 32m: twelve night hours of 1h 08m.
Which planet rules the first hour that day?
Mercury, from 08:20 to 09:12: 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.