Planetary hours
in Rio de Janeiro.
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 Monday, 15 December 2025: day of the Moon
- Sunrise
- 05:01
- Sunset
- 18:34
- Next sunrise
- 05:02
A day hour lasts 1h 08m; a night hour, 52 min. Local time (America/Sao_Paulo).
Day
- 1☽︎ Moon05:01 – 06:09
- 2♄︎ Saturn06:09 – 07:17
- 3♃︎ Jupiter07:17 – 08:24
- 4♂︎ Mars08:24 – 09:32
- 5☉︎ Sun09:32 – 10:40
- 6♀︎ Venus10:40 – 11:48
- 7☿︎ Mercury11:48 – 12:55
- 8☽︎ Moon12:55 – 14:03
- 9♄︎ Saturn14:03 – 15:11
- 10♃︎ Jupiter15:11 – 16:18
- 11♂︎ Mars16:18 – 17:26
- 12☉︎ Sun17:26 – 18:34
Night
- 1♀︎ Venus18:34 – 19:26
- 2☿︎ Mercury19:26 – 20:18
- 3☽︎ Moon20:18 – 21:11
- 4♄︎ Saturn21:11 – 22:03
- 5♃︎ Jupiter22:03 – 22:55
- 6♂︎ Mars22:55 – 23:48
- 7☉︎ Sun23:48 – 00:40
- 8♀︎ Venus00:40 – 01:32
- 9☿︎ Mercury01:32 – 02:25
- 10☽︎ Moon02:25 – 03:17
- 11♄︎ Saturn03:17 – 04:09
- 12♃︎ Jupiter04:09 – 05:02
Other cities · Brazil
Questions
How are the planetary hours calculated in Rio de Janeiro?
On Monday, 15 December 2025, the Sun rises at 05:01 and sets at 18:34: the day lasts 13h 32m, that is twelve day hours of 1h 08m. The night, until the next sunrise at 05:02, lasts 10h 28m: twelve night hours of 52 min.
Which planet rules the first hour that day?
The Moon, from 05:01 to 06:09: the first hour of a day always goes to the planet of the weekday. The next ones follow the Chaldean order: Saturn, Jupiter, Mars, the Sun, Venus, Mercury, then the Moon 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.