Planetary hours
in Mar del Plata.
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, 31 July 2026: day of Venus
- Sunrise
- 07:51
- Sunset
- 18:02
- Next sunrise
- 07:50
A day hour lasts 51 min; a night hour, 1h 09m. Local time (America/Argentina/Buenos_Aires).
Day
- 1♀︎ Venus07:51 – 08:42
- 2☿︎ Mercury08:42 – 09:33
- 3☽︎ Moon09:33 – 10:24
- 4♄︎ Saturn10:24 – 11:15
- 5♃︎ Jupiter11:15 – 12:05
- 6♂︎ Mars12:05 – 12:56
- 7☉︎ Sun12:56 – 13:47
- 8♀︎ Venus13:47 – 14:38
- 9☿︎ Mercury14:38 – 15:29
- 10☽︎ Moon15:29 – 16:20
- 11♄︎ Saturn16:20 – 17:11
- 12♃︎ Jupiter17:11 – 18:02
Night
- 1♂︎ Mars18:02 – 19:11
- 2☉︎ Sun19:11 – 20:20
- 3♀︎ Venus20:20 – 21:29
- 4☿︎ Mercury21:29 – 22:38
- 5☽︎ Moon22:38 – 23:47
- 6♄︎ Saturn23:47 – 00:56
- 7♃︎ Jupiter00:56 – 02:05
- 8♂︎ Mars02:05 – 03:14
- 9☉︎ Sun03:14 – 04:23
- 10♀︎ Venus04:23 – 05:32
- 11☿︎ Mercury05:32 – 06:41
- 12☽︎ Moon06:41 – 07:50
Other cities · Argentina
Questions
How are the planetary hours calculated in Mar del Plata?
On Friday, 31 July 2026, the Sun rises at 07:51 and sets at 18:02: the day lasts 10h 10m, that is twelve day hours of 51 min. The night, until the next sunrise at 07:50, lasts 13h 49m: twelve night hours of 1h 09m.
Which planet rules the first hour that day?
Venus, from 07:51 to 08:42: 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.