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 Friday, 12 December 2025: day of Venus
- Sunrise
- 05:00
- Sunset
- 18:32
- Next sunrise
- 05:01
A day hour lasts 1h 08m; a night hour, 52 min. Local time (America/Sao_Paulo).
Day
- 1♀︎ Venus05:00 – 06:08
- 2☿︎ Mercury06:08 – 07:16
- 3☽︎ Moon07:16 – 08:23
- 4♄︎ Saturn08:23 – 09:31
- 5♃︎ Jupiter09:31 – 10:39
- 6♂︎ Mars10:39 – 11:46
- 7☉︎ Sun11:46 – 12:54
- 8♀︎ Venus12:54 – 14:01
- 9☿︎ Mercury14:01 – 15:09
- 10☽︎ Moon15:09 – 16:17
- 11♄︎ Saturn16:17 – 17:24
- 12♃︎ Jupiter17:24 – 18:32
Night
- 1♂︎ Mars18:32 – 19:24
- 2☉︎ Sun19:24 – 20:17
- 3♀︎ Venus20:17 – 21:09
- 4☿︎ Mercury21:09 – 22:01
- 5☽︎ Moon22:01 – 22:54
- 6♄︎ Saturn22:54 – 23:46
- 7♃︎ Jupiter23:46 – 00:39
- 8♂︎ Mars00:39 – 01:31
- 9☉︎ Sun01:31 – 02:24
- 10♀︎ Venus02:24 – 03:16
- 11☿︎ Mercury03:16 – 04:08
- 12☽︎ Moon04:08 – 05:01
Other cities · Brazil
Questions
How are the planetary hours calculated in Rio de Janeiro?
On Friday, 12 December 2025, the Sun rises at 05:00 and sets at 18:32: the day lasts 13h 31m, that is twelve day hours of 1h 08m. The night, until the next sunrise at 05:01, lasts 10h 29m: twelve night hours of 52 min.
Which planet rules the first hour that day?
Venus, from 05:00 to 06:08: 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.