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 Tuesday, 21 April 2026: day of Mars
- Sunrise
- 04:53
- Sunset
- 18:18
- Next sunrise
- 04:51
A day hour lasts 1h 07m; a night hour, 53 min. Local time (Asia/Tokyo).
Day
- 1♂︎ Mars04:53 – 06:00
- 2☉︎ Sun06:00 – 07:07
- 3♀︎ Venus07:07 – 08:14
- 4☿︎ Mercury08:14 – 09:21
- 5☽︎ Moon09:21 – 10:28
- 6♄︎ Saturn10:28 – 11:35
- 7♃︎ Jupiter11:35 – 12:42
- 8♂︎ Mars12:42 – 13:49
- 9☉︎ Sun13:49 – 14:56
- 10♀︎ Venus14:56 – 16:03
- 11☿︎ Mercury16:03 – 17:10
- 12☽︎ Moon17:10 – 18:18
Night
- 1♄︎ Saturn18:18 – 19:10
- 2♃︎ Jupiter19:10 – 20:03
- 3♂︎ Mars20:03 – 20:56
- 4☉︎ Sun20:56 – 21:49
- 5♀︎ Venus21:49 – 22:42
- 6☿︎ Mercury22:42 – 23:34
- 7☽︎ Moon23:34 – 00:27
- 8♄︎ Saturn00:27 – 01:20
- 9♃︎ Jupiter01:20 – 02:13
- 10♂︎ Mars02:13 – 03:06
- 11☉︎ Sun03:06 – 03:59
- 12♀︎ Venus03:59 – 04:51
Questions
How are the planetary hours calculated in Sendai?
On Tuesday, 21 April 2026, the Sun rises at 04:53 and sets at 18:18: the day lasts 13h 25m, that is twelve day hours of 1h 07m. The night, until the next sunrise at 04:51, lasts 10h 34m: twelve night hours of 53 min.
Which planet rules the first hour that day?
Mars, from 04:53 to 06:00: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: the Sun, Venus, Mercury, the Moon, Saturn, Jupiter, then Mars 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.