Planetary hours
in Sendai.
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 Saturday, 3 May 2025: day of Saturn
- Sunrise
- 04:37
- Sunset
- 18:29
- Next sunrise
- 04:36
A day hour lasts 1h 09m; a night hour, 51 min. Local time (Asia/Tokyo).
Day
- 1♄︎ Saturn04:37 – 05:47
- 2♃︎ Jupiter05:47 – 06:56
- 3♂︎ Mars06:56 – 08:05
- 4☉︎ Sun08:05 – 09:15
- 5♀︎ Venus09:15 – 10:24
- 6☿︎ Mercury10:24 – 11:33
- 7☽︎ Moon11:33 – 12:43
- 8♄︎ Saturn12:43 – 13:52
- 9♃︎ Jupiter13:52 – 15:01
- 10♂︎ Mars15:01 – 16:10
- 11☉︎ Sun16:10 – 17:20
- 12♀︎ Venus17:20 – 18:29
Night
- 1☿︎ Mercury18:29 – 19:20
- 2☽︎ Moon19:20 – 20:10
- 3♄︎ Saturn20:10 – 21:01
- 4♃︎ Jupiter21:01 – 21:51
- 5♂︎ Mars21:51 – 22:42
- 6☉︎ Sun22:42 – 23:33
- 7♀︎ Venus23:33 – 00:23
- 8☿︎ Mercury00:23 – 01:14
- 9☽︎ Moon01:14 – 02:04
- 10♄︎ Saturn02:04 – 02:55
- 11♃︎ Jupiter02:55 – 03:46
- 12♂︎ Mars03:46 – 04:36
Questions
How are the planetary hours calculated in Sendai?
On Saturday, 3 May 2025, the Sun rises at 04:37 and sets at 18:29: the day lasts 13h 52m, that is twelve day hours of 1h 09m. The night, until the next sunrise at 04:36, lasts 10h 07m: twelve night hours of 51 min.
Which planet rules the first hour that day?
Saturn, from 04:37 to 05:47: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Jupiter, Mars, the Sun, Venus, Mercury, the Moon, then Saturn 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.