Planetary hours
in Surabaya.
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, 18 October 2025: day of Saturn
- Sunrise
- 05:05
- Sunset
- 17:22
- Next sunrise
- 05:05
A day hour lasts 1h 01m; a night hour, 59 min. Local time (Asia/Jakarta).
Day
- 1♄︎ Saturn05:05 – 06:07
- 2♃︎ Jupiter06:07 – 07:08
- 3♂︎ Mars07:08 – 08:10
- 4☉︎ Sun08:10 – 09:11
- 5♀︎ Venus09:11 – 10:12
- 6☿︎ Mercury10:12 – 11:14
- 7☽︎ Moon11:14 – 12:15
- 8♄︎ Saturn12:15 – 13:16
- 9♃︎ Jupiter13:16 – 14:18
- 10♂︎ Mars14:18 – 15:19
- 11☉︎ Sun15:19 – 16:21
- 12♀︎ Venus16:21 – 17:22
Night
- 1☿︎ Mercury17:22 – 18:21
- 2☽︎ Moon18:21 – 19:19
- 3♄︎ Saturn19:19 – 20:18
- 4♃︎ Jupiter20:18 – 21:16
- 5♂︎ Mars21:16 – 22:15
- 6☉︎ Sun22:15 – 23:14
- 7♀︎ Venus23:14 – 00:12
- 8☿︎ Mercury00:12 – 01:11
- 9☽︎ Moon01:11 – 02:09
- 10♄︎ Saturn02:09 – 03:08
- 11♃︎ Jupiter03:08 – 04:06
- 12♂︎ Mars04:06 – 05:05
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Questions
How are the planetary hours calculated in Surabaya?
On Saturday, 18 October 2025, the Sun rises at 05:05 and sets at 17:22: the day lasts 12h 17m, that is twelve day hours of 1h 01m. The night, until the next sunrise at 05:05, lasts 11h 43m: twelve night hours of 59 min.
Which planet rules the first hour that day?
Saturn, from 05:05 to 06:07: 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.