Lunar Calendar Month January 2023 (Puerto Rico)

The Moon is the only natural satellite of the Earth and the fifth largest moon in the Solar System. It is the largest natural satellite in the solar system relative to the size of its planet. The following is information specific for San Juan, Puerto Rico during January 2023.

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Date and time of moon phases

The information in the following table comes from calculations published by the Astronomical Applications Department of the U.S. Naval Observatory.

Moon phases	Dates	Time
full moon	2023-01-06	19:08
3rd quarter	2023-01-14	22:10
new moon	2023-01-21	16:53
1st quarter	2023-01-28	11:19

Apogee and perigee of the Moon

The following table shows the dates of perigee and apogee of the Moon during January 2023.

Position	Dates	Time	Distance	Notes
Apogee	2023-01-08	05:20	406,458 km
Perigee	2023-01-21	16:59	356,569 km	Maximum perigee in 2023!

Moon-Planet Conjunctions

A Moon-planet conjunction occurs when an astronomical object has either the same, or nearly the same, right ascension or the same ecliptic longitude of that of the Moon, as observed from Earth.

Astronomical Objects	Date and Time
Pleiades	2023-01-02 21:24
Mars	2023-01-03 15:35
Pollux	2023-01-07 09:40
Beehive	2023-01-08 11:23
Antares	2023-01-18 05:32
Saturn	2023-01-23 03:22
Venus	2023-01-23 04:20
Jupiter	2023-01-25 22:00
Pleiades	2023-01-30 03:21
Mars	2023-01-31 00:24

Illumination of the Moon

The following table depicts the illumination of the Moon, calculated at 00:00, throughtout the 31 days of January 2023.

January 2023
w	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
Week 52	26 Monday	27 Tuesday	28 Wednesday	29 Thursday	30 Friday	31 Saturday	1Sunday 71.2% illuminated Age: 9.4
Week 1	2Monday 79.9% illuminated Age: 10.4	3Tuesday 87.2% illuminated Age: 11.3	4Wednesday 93% illuminated Age: 12.2	5Thursday 97.1% illuminated Age: 13.2	6Friday 99.4% illuminated Age: 14.1	7Saturday 100% illuminated Age: 15	8Sunday 98.7% illuminated Age: 15.8
Week 2	9Monday 95.7% illuminated Age: 16.7	10Tuesday 91.1% illuminated Age: 17.6	11Wednesday 84.9% illuminated Age: 18.5	12Thursday 77.5% illuminated Age: 19.4	13Friday 68.8% illuminated Age: 20.3	14Saturday 59.3% illuminated Age: 21.3	15Sunday 49.2% illuminated Age: 22.2
Week 3	16Monday 38.7% illuminated Age: 23.2	17Tuesday 28.5% illuminated Age: 24.2	18Wednesday 18.9% illuminated Age: 25.3	19Thursday 10.6% illuminated Age: 26.4	20Friday 4.4% illuminated Age: 27.5	21Saturday 0.8% illuminated Age: 28.7	22Sunday 0.1% illuminated Age: 0.3
Week 4	23Monday 2.6% illuminated Age: 1.5	24Tuesday 7.8% illuminated Age: 2.7	25Wednesday 15.3% illuminated Age: 3.8	26Thursday 24.4% illuminated Age: 4.9	27Friday 34.5% illuminated Age: 5.9	28Saturday 44.9% illuminated Age: 6.9	29Sunday 55.2% illuminated Age: 7.9
Week 5	30Monday 65.1% illuminated Age: 8.8	31Tuesday 74.1% illuminated Age: 9.7	1 Wednesday	2 Thursday	3 Friday	4 Saturday	5 Sunday
	6 Monday	7 Tuesday	8 Wednesday	9 Thursday	10 Friday	11 Saturday	12 Sunday