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, 12 September 2025: day of Venus
- Sunrise
- 05:24
- Sunset
- 17:26
- Next sunrise
- 05:23
A day hour lasts 1h 00m; a night hour, 1h 00m. Local time (Asia/Jakarta).
Day
- 1♀︎ Venus05:24 – 06:24
- 2☿︎ Mercury06:24 – 07:24
- 3☽︎ Moon07:24 – 08:24
- 4♄︎ Saturn08:24 – 09:24
- 5♃︎ Jupiter09:24 – 10:25
- 6♂︎ Mars10:25 – 11:25
- 7☉︎ Sun11:25 – 12:25
- 8♀︎ Venus12:25 – 13:25
- 9☿︎ Mercury13:25 – 14:25
- 10☽︎ Moon14:25 – 15:26
- 11♄︎ Saturn15:26 – 16:26
- 12♃︎ Jupiter16:26 – 17:26
Night
- 1♂︎ Mars17:26 – 18:26
- 2☉︎ Sun18:26 – 19:26
- 3♀︎ Venus19:26 – 20:25
- 4☿︎ Mercury20:25 – 21:25
- 5☽︎ Moon21:25 – 22:25
- 6♄︎ Saturn22:25 – 23:25
- 7♃︎ Jupiter23:25 – 00:24
- 8♂︎ Mars00:24 – 01:24
- 9☉︎ Sun01:24 – 02:24
- 10♀︎ Venus02:24 – 03:24
- 11☿︎ Mercury03:24 – 04:23
- 12☽︎ Moon04:23 – 05:23
Other cities · Indonesia
Questions
How are the planetary hours calculated in Surabaya?
On Friday, 12 September 2025, the Sun rises at 05:24 and sets at 17:26: the day lasts 12h 02m, that is twelve day hours of 1h 00m. The night, until the next sunrise at 05:23, lasts 11h 57m: twelve night hours of 1h 00m.
Which planet rules the first hour that day?
Venus, from 05:24 to 06:24: 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.