Lunar Calendar Month September 2018 (United States)

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 Washington, District of Columbia, United States during September 2018.

Choose a country from the list to get relevant information:

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	2018-09-02	22:37
new moon	2018-09-09	14:01
1st quarter	2018-09-16	19:15
full moon	2018-09-24	22:52

Apogee and perigee of the Moon

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

Position	Dates	Time	Distance	Notes
Perigee	2018-09-07	21:23	361,354 km
Apogee	2018-09-19	20:55	404,874 km

Meteor Activity

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

Name	Peak Day
Aurigids	2018-09-01
Sept. ε-Perseids	2018-09-09
Dayt. Sextantids	2018-09-27

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
Aldebaran	2018-09-02 21:34
Beehive	2018-09-06 22:13
Jupiter	2018-09-13 22:21
Saturn	2018-09-17 12:46
Aldebaran	2018-09-30 03:06

Illumination of the Moon

The following table depicts the illumination of the Moon, calculated at 00:00, throughtout the 30 days of September 2018.

September 2018
w	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
Week 35	27Monday	28Tuesday	29Wednesday	30Thursday	31Friday	1Saturday 70.6% illuminated Age:20.2	2Sunday 60.4% illuminated Age:21.2
Week 36	3Monday 49.5% illuminated Age:22.2	4Tuesday 38.3% illuminated Age:23.3	5Wednesday 27.5% illuminated Age:24.3	6Thursday 17.7% illuminated Age:25.5	7Friday 9.5% illuminated Age:26.6	8Saturday 3.6% illuminated Age:27.7	9Sunday 0.5% illuminated Age:28.9
Week 37	10Monday 0.3% illuminated Age:0.5	11Tuesday 2.9% illuminated Age:1.6	12Wednesday 7.9% illuminated Age:2.7	13Thursday 14.9% illuminated Age:3.7	14Friday 23.2% illuminated Age:4.7	15Saturday 32.4% illuminated Age:5.7	16Sunday 42.1% illuminated Age:6.6
Week 38	17Monday 51.8% illuminated Age:7.6	18Tuesday 61.3% illuminated Age:8.5	19Wednesday 70.3% illuminated Age:9.3	20Thursday 78.5% illuminated Age:10.2	21Friday 85.8% illuminated Age:11.1	22Saturday 91.8% illuminated Age:12	23Sunday 96.3% illuminated Age:12.9
Week 39	24Monday 99.1% illuminated Age:13.9	25Tuesday 100% illuminated Age:14.8	26Wednesday 98.9% illuminated Age:15.8	27Thursday 95.6% illuminated Age:16.7	28Friday 90.3% illuminated Age:17.7	29Saturday 83% illuminated Age:18.8	30Sunday 74.1% illuminated Age:19.8
	1Monday	2Tuesday	3Wednesday	4Thursday	5Friday	6Saturday	7Sunday
	8Monday	9Tuesday	10Wednesday	11Thursday	12Friday	13Saturday	14Sunday