Lunar Calendar Month January 2021 (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 2021.

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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
3rd quarter	2021-01-06	05:37
new moon	2021-01-13	01:00
1st quarter	2021-01-20	17:01
full moon	2021-01-28	15:16

Apogee and perigee of the Moon

The following table shows the dates of perigee and apogee of the Moon during January 2021.

Position	Dates	Time	Distance	Notes
Perigee	2021-01-09	11:40	367,389 km
Apogee	2021-01-21	09:12	404,360 km

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
Beehive	2021-01-01 03:05
Venus	2021-01-11 16:11
Beehive	2021-01-28 10:50

Illumination of the Moon

The following table depicts the illumination of the Moon, calculated at 00:00, throughtout the 31 days of January 2021.

January 2021
w	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
Week 53	28Monday	29Tuesday	30Wednesday	31Thursday	1Friday 95.7% illuminated Age:16.7	2Saturday 90.4% illuminated Age:17.7	3Sunday 83.1% illuminated Age:18.8
Week 1	4Monday 74.1% illuminated Age:19.8	5Tuesday 63.8% illuminated Age:20.8	6Wednesday 52.8% illuminated Age:21.9	7Thursday 41.4% illuminated Age:23	8Friday 30.4% illuminated Age:24	9Saturday 20.3% illuminated Age:25.1	10Sunday 11.8% illuminated Age:26.2
Week 2	11Monday 5.4% illuminated Age:27.3	12Tuesday 1.4% illuminated Age:28.4	13Wednesday 0% illuminated Age:29.5	14Thursday 1.2% illuminated Age:1	15Friday 4.7% illuminated Age:2	16Saturday 10.1% illuminated Age:3	17Sunday 17% illuminated Age:4
Week 3	18Monday 25.1% illuminated Age:4.9	19Tuesday 33.9% illuminated Age:5.8	20Wednesday 43.2% illuminated Age:6.7	21Thursday 52.6% illuminated Age:7.6	22Friday 61.9% illuminated Age:8.5	23Saturday 70.9% illuminated Age:9.4	24Sunday 79.1% illuminated Age:10.3
Week 4	25Monday 86.5% illuminated Age:11.2	26Tuesday 92.5% illuminated Age:12.2	27Wednesday 97% illuminated Age:13.1	28Thursday 99.5% illuminated Age:14.1	29Friday 99.8% illuminated Age:15.1	30Saturday 97.8% illuminated Age:16.2	31Sunday 93.3% illuminated Age:17.2
	1Monday	2Tuesday	3Wednesday	4Thursday	5Friday	6Saturday	7Sunday
	8Monday	9Tuesday	10Wednesday	11Thursday	12Friday	13Saturday	14Sunday