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, 30 July 2025: day of Mercury
- Sunrise
- 04:36
- Sunset
- 18:48
- Next sunrise
- 04:37
A day hour lasts 1h 11m; a night hour, 49 min. Local time (Asia/Tokyo).
Day
- 1☿︎ Mercury04:36 – 05:47
- 2☽︎ Moon05:47 – 06:58
- 3♄︎ Saturn06:58 – 08:09
- 4♃︎ Jupiter08:09 – 09:20
- 5♂︎ Mars09:20 – 10:31
- 6☉︎ Sun10:31 – 11:42
- 7♀︎ Venus11:42 – 12:53
- 8☿︎ Mercury12:53 – 14:04
- 9☽︎ Moon14:04 – 15:15
- 10♄︎ Saturn15:15 – 16:26
- 11♃︎ Jupiter16:26 – 17:37
- 12♂︎ Mars17:37 – 18:48
Night
- 1☉︎ Sun18:48 – 19:37
- 2♀︎ Venus19:37 – 20:26
- 3☿︎ Mercury20:26 – 21:15
- 4☽︎ Moon21:15 – 22:04
- 5♄︎ Saturn22:04 – 22:54
- 6♃︎ Jupiter22:54 – 23:43
- 7♂︎ Mars23:43 – 00:32
- 8☉︎ Sun00:32 – 01:21
- 9♀︎ Venus01:21 – 02:10
- 10☿︎ Mercury02:10 – 02:59
- 11☽︎ Moon02:59 – 03:48
- 12♄︎ Saturn03:48 – 04:37
Questions
How are the planetary hours calculated in Sendai?
On Wednesday, 30 July 2025, the Sun rises at 04:36 and sets at 18:48: the day lasts 14h 11m, that is twelve day hours of 1h 11m. The night, until the next sunrise at 04:37, lasts 9h 49m: twelve night hours of 49 min.
Which planet rules the first hour that day?
Mercury, from 04:36 to 05:47: 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.