Lunar Calendar Month May 2018 (Costa Rica)

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 José, Costa Rica during May 2018.

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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	2018-05-07	20:09
new moon	2018-05-15	05:48
1st quarter	2018-05-21	21:49
full moon	2018-05-29	08:19

Apogee and perigee of the Moon

The following table shows the dates of perigee and apogee of the Moon during May 2018.

Position	Dates	Time	Distance	Notes
Apogee	2018-05-05	18:36	404,457 km
Perigee	2018-05-17	15:07	363,776 km

Meteor Activity

Active meteor showers this month and their peak days. For more information, see the meteor shower calendar 2018.

Name	Peak Day
η-Aquariids	2018-05-06
η-Lyrids	2018-05-09

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
Saturn	2018-05-04 14:31
Mars	2018-05-06 01:24
Mercury	2018-05-13 11:21
Venus	2018-05-17 12:11
Beehive	2018-05-20 05:57
Regulus	2018-05-21 18:53
Jupiter	2018-05-27 11:39
Saturn	2018-05-31 19:20

Illumination of the Moon

The following table depicts the illumination of the Moon, calculated at 00:00, throughtout the 31 days of May 2018.

May 2018
w	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
Week 18	30Monday	1Tuesday 98.4% illuminated Age:15.9	2Wednesday 95% illuminated Age:16.9	3Thursday 89.9% illuminated Age:17.8	4Friday 83.3% illuminated Age:18.7	5Saturday 75.7% illuminated Age:19.6	6Sunday 67.1% illuminated Age:20.5
Week 19	7Monday 58% illuminated Age:21.4	8Tuesday 48.4% illuminated Age:22.3	9Wednesday 38.9% illuminated Age:23.2	10Thursday 29.5% illuminated Age:24.1	11Friday 20.7% illuminated Age:25.1	12Saturday 12.9% illuminated Age:26.1	13Sunday 6.5% illuminated Age:27.1
Week 20	14Monday 2.1% illuminated Age:28.2	15Tuesday 0.1% illuminated Age:29.3	16Wednesday 0.8% illuminated Age:0.8	17Thursday 4.3% illuminated Age:2	18Friday 10.5% illuminated Age:3.1	19Saturday 18.8% illuminated Age:4.2	20Sunday 28.8% illuminated Age:5.3
Week 21	21Monday 39.8% illuminated Age:6.4	22Tuesday 51.1% illuminated Age:7.5	23Wednesday 62.1% illuminated Age:8.5	24Thursday 72.4% illuminated Age:9.6	25Friday 81.4% illuminated Age:10.6	26Saturday 88.8% illuminated Age:11.6	27Sunday 94.5% illuminated Age:12.5
Week 22	28Monday 98.2% illuminated Age:13.5	29Tuesday 99.9% illuminated Age:14.4	30Wednesday 99.6% illuminated Age:15.4	31Thursday 97.4% illuminated Age:16.3	1Friday	2Saturday	3Sunday
	4Monday	5Tuesday	6Wednesday	7Thursday	8Friday	9Saturday	10Sunday
	11Monday	12Tuesday	13Wednesday	14Thursday	15Friday	16Saturday	17Sunday