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 Sunday, 16 August 2026: day of the Sun
- Sunrise
- 04:51
- Sunset
- 18:29
- Next sunrise
- 04:52
A day hour lasts 1h 08m; a night hour, 52 min. Local time (Asia/Tokyo).
Day
- 1☉︎ Sun04:51 – 05:59
- 2♀︎ Venus05:59 – 07:07
- 3☿︎ Mercury07:07 – 08:16
- 4☽︎ Moon08:16 – 09:24
- 5♄︎ Saturn09:24 – 10:32
- 6♃︎ Jupiter10:32 – 11:40
- 7♂︎ Mars11:40 – 12:48
- 8☉︎ Sun12:48 – 13:56
- 9♀︎ Venus13:56 – 15:05
- 10☿︎ Mercury15:05 – 16:13
- 11☽︎ Moon16:13 – 17:21
- 12♄︎ Saturn17:21 – 18:29
Night
- 1♃︎ Jupiter18:29 – 19:21
- 2♂︎ Mars19:21 – 20:13
- 3☉︎ Sun20:13 – 21:05
- 4♀︎ Venus21:05 – 21:57
- 5☿︎ Mercury21:57 – 22:49
- 6☽︎ Moon22:49 – 23:41
- 7♄︎ Saturn23:41 – 00:32
- 8♃︎ Jupiter00:32 – 01:24
- 9♂︎ Mars01:24 – 02:16
- 10☉︎ Sun02:16 – 03:08
- 11♀︎ Venus03:08 – 04:00
- 12☿︎ Mercury04:00 – 04:52
Questions
How are the planetary hours calculated in Sendai?
On Sunday, 16 August 2026, the Sun rises at 04:51 and sets at 18:29: the day lasts 13h 38m, that is twelve day hours of 1h 08m. The night, until the next sunrise at 04:52, lasts 10h 23m: twelve night hours of 52 min.
Which planet rules the first hour that day?
The Sun, from 04:51 to 05:59: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Venus, Mercury, the Moon, Saturn, Jupiter, Mars, then the Sun 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.