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 Wednesday, 21 October 2026: day of Mercury
- Sunrise
- 05:50
- Sunset
- 16:51
- Next sunrise
- 05:51
A day hour lasts 55 min; a night hour, 1h 05m. Local time (Asia/Tokyo).
Day
- 1☿︎ Mercury05:50 – 06:45
- 2☽︎ Moon06:45 – 07:40
- 3♄︎ Saturn07:40 – 08:35
- 4♃︎ Jupiter08:35 – 09:30
- 5♂︎ Mars09:30 – 10:25
- 6☉︎ Sun10:25 – 11:20
- 7♀︎ Venus11:20 – 12:15
- 8☿︎ Mercury12:15 – 13:10
- 9☽︎ Moon13:10 – 14:06
- 10♄︎ Saturn14:06 – 15:01
- 11♃︎ Jupiter15:01 – 15:56
- 12♂︎ Mars15:56 – 16:51
Night
- 1☉︎ Sun16:51 – 17:56
- 2♀︎ Venus17:56 – 19:01
- 3☿︎ Mercury19:01 – 20:06
- 4☽︎ Moon20:06 – 21:11
- 5♄︎ Saturn21:11 – 22:16
- 6♃︎ Jupiter22:16 – 23:21
- 7♂︎ Mars23:21 – 00:26
- 8☉︎ Sun00:26 – 01:31
- 9♀︎ Venus01:31 – 02:36
- 10☿︎ Mercury02:36 – 03:41
- 11☽︎ Moon03:41 – 04:46
- 12♄︎ Saturn04:46 – 05:51
Questions
How are the planetary hours calculated in Sendai?
On Wednesday, 21 October 2026, the Sun rises at 05:50 and sets at 16:51: the day lasts 11h 00m, that is twelve day hours of 55 min. The night, until the next sunrise at 05:51, lasts 13h 01m: twelve night hours of 1h 05m.
Which planet rules the first hour that day?
Mercury, from 05:50 to 06:45: 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.