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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 phasesDatesTime
3rd quarter2018-09-0222:37
new moon2018-09-0914:01
1st quarter2018-09-1619:15
full moon2018-09-2422:52

Apogee and perigee of the Moon

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

PositionDatesTimeDistanceNotes
Perigee2018-09-0721:23361,354 km
Apogee2018-09-1920:55404,874 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 ObjectsDate and Time
Aldebaran2018-09-02 21:34
Beehive2018-09-06 22:13
Jupiter2018-09-13 22:21
Saturn2018-09-17 12:46
Aldebaran2018-09-30 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
wMondayTuesdayWednesdayThursdayFridaySaturdaySunday
Week 35
27Monday
 
28Tuesday
 
29Wednesday
 
30Thursday
 
31Friday
 
1Saturday
 
70.6% illuminated
70.6% illuminated
Age:20.2
2Sunday
 
60.4% illuminated
60.4% illuminated
Age:21.2
Week 36
3Monday
 
49.5% illuminated
49.5% illuminated
Age:22.2
4Tuesday
 
38.3% illuminated
38.3% illuminated
Age:23.3
5Wednesday
 
27.5% illuminated
27.5% illuminated
Age:24.3
6Thursday
 
17.7% illuminated
17.7% illuminated
Age:25.5
7Friday
 
9.5% illuminated
9.5% illuminated
Age:26.6
8Saturday
 
3.6% illuminated
3.6% illuminated
Age:27.7
9Sunday
 
0.5% illuminated
0.5% illuminated
Age:28.9
Week 37
10Monday
 
0.3% illuminated
0.3% illuminated
Age:0.5
11Tuesday
 
2.9% illuminated
2.9% illuminated
Age:1.6
12Wednesday
 
7.9% illuminated
7.9% illuminated
Age:2.7
13Thursday
 
14.9% illuminated
14.9% illuminated
Age:3.7
14Friday
 
23.2% illuminated
23.2% illuminated
Age:4.7
15Saturday
 
32.4% illuminated
32.4% illuminated
Age:5.7
16Sunday
 
42.1% illuminated
42.1% illuminated
Age:6.6
Week 38
17Monday
 
51.8% illuminated
51.8% illuminated
Age:7.6
18Tuesday
 
61.3% illuminated
61.3% illuminated
Age:8.5
19Wednesday
 
70.3% illuminated
70.3% illuminated
Age:9.3
20Thursday
 
78.5% illuminated
78.5% illuminated
Age:10.2
21Friday
 
85.8% illuminated
85.8% illuminated
Age:11.1
22Saturday
 
91.8% illuminated
91.8% illuminated
Age:12
23Sunday
 
96.3% illuminated
96.3% illuminated
Age:12.9
Week 39
24Monday
 
99.1% illuminated
99.1% illuminated
Age:13.9
25Tuesday
 
100% illuminated
100% illuminated
Age:14.8
26Wednesday
 
98.9% illuminated
98.9% illuminated
Age:15.8
27Thursday
 
95.6% illuminated
95.6% illuminated
Age:16.7
28Friday
 
90.3% illuminated
90.3% illuminated
Age:17.7
29Saturday
 
83% illuminated
83% illuminated
Age:18.8
30Sunday
 
74.1% illuminated
74.1% illuminated
Age:19.8
1Monday
 
2Tuesday
 
3Wednesday
 
4Thursday
 
5Friday
 
6Saturday
 
7Sunday
 
8Monday
 
9Tuesday
 
10Wednesday
 
11Thursday
 
12Friday
 
13Saturday
 
14Sunday
 
Content last updated on 2016-01-23