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, 12 December 2026: day of Saturn
- Sunrise
- 06:43
- Sunset
- 16:16
- Next sunrise
- 06:44
A day hour lasts 48 min; a night hour, 1h 12m. Local time (Asia/Tokyo).
Day
- 1♄︎ Saturn06:43 – 07:31
- 2♃︎ Jupiter07:31 – 08:18
- 3♂︎ Mars08:18 – 09:06
- 4☉︎ Sun09:06 – 09:54
- 5♀︎ Venus09:54 – 10:42
- 6☿︎ Mercury10:42 – 11:29
- 7☽︎ Moon11:29 – 12:17
- 8♄︎ Saturn12:17 – 13:05
- 9♃︎ Jupiter13:05 – 13:53
- 10♂︎ Mars13:53 – 14:40
- 11☉︎ Sun14:40 – 15:28
- 12♀︎ Venus15:28 – 16:16
Night
- 1☿︎ Mercury16:16 – 17:28
- 2☽︎ Moon17:28 – 18:41
- 3♄︎ Saturn18:41 – 19:53
- 4♃︎ Jupiter19:53 – 21:05
- 5♂︎ Mars21:05 – 22:18
- 6☉︎ Sun22:18 – 23:30
- 7♀︎ Venus23:30 – 00:42
- 8☿︎ Mercury00:42 – 01:54
- 9☽︎ Moon01:54 – 03:07
- 10♄︎ Saturn03:07 – 04:19
- 11♃︎ Jupiter04:19 – 05:31
- 12♂︎ Mars05:31 – 06:44
Questions
How are the planetary hours calculated in Sendai?
On Saturday, 12 December 2026, the Sun rises at 06:43 and sets at 16:16: the day lasts 9h 33m, that is twelve day hours of 48 min. The night, until the next sunrise at 06:44, lasts 14h 28m: twelve night hours of 1h 12m.
Which planet rules the first hour that day?
Saturn, from 06:43 to 07:31: 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.