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 Friday, 19 December 2025: day of Venus
- Sunrise
- 05:09
- Sunset
- 17:42
- Next sunrise
- 05:10
A day hour lasts 1h 03m; a night hour, 57 min. Local time (Asia/Jakarta).
Day
- 1♀︎ Venus05:09 – 06:12
- 2☿︎ Mercury06:12 – 07:15
- 3☽︎ Moon07:15 – 08:17
- 4♄︎ Saturn08:17 – 09:20
- 5♃︎ Jupiter09:20 – 10:23
- 6♂︎ Mars10:23 – 11:26
- 7☉︎ Sun11:26 – 12:28
- 8♀︎ Venus12:28 – 13:31
- 9☿︎ Mercury13:31 – 14:34
- 10☽︎ Moon14:34 – 15:36
- 11♄︎ Saturn15:36 – 16:39
- 12♃︎ Jupiter16:39 – 17:42
Night
- 1♂︎ Mars17:42 – 18:39
- 2☉︎ Sun18:39 – 19:37
- 3♀︎ Venus19:37 – 20:34
- 4☿︎ Mercury20:34 – 21:31
- 5☽︎ Moon21:31 – 22:28
- 6♄︎ Saturn22:28 – 23:26
- 7♃︎ Jupiter23:26 – 00:23
- 8♂︎ Mars00:23 – 01:20
- 9☉︎ Sun01:20 – 02:18
- 10♀︎ Venus02:18 – 03:15
- 11☿︎ Mercury03:15 – 04:12
- 12☽︎ Moon04:12 – 05:10
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Questions
How are the planetary hours calculated in Surabaya?
On Friday, 19 December 2025, the Sun rises at 05:09 and sets at 17:42: the day lasts 12h 33m, that is twelve day hours of 1h 03m. The night, until the next sunrise at 05:10, lasts 11h 28m: twelve night hours of 57 min.
Which planet rules the first hour that day?
Venus, from 05:09 to 06:12: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Mercury, the Moon, Saturn, Jupiter, Mars, the Sun, then Venus 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.