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Lunar Calendar Month September 2011 (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 2011.

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
1st quarter2011-09-0413:39
full moon2011-09-1205:27
3rd quarter2011-09-2009:39
new moon2011-09-2707:09

Apogee and perigee of the Moon

The following table shows the dates of perigee and apogee of the Moon during September 2011.

PositionDatesTimeDistanceNotes
Apogee2011-09-1502:24406,067 km
Perigee2011-09-2721:02357,555 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
Spica2011-09-01 06:06
Pleiades2011-09-18 02:46
Mars2011-09-23 04:23

Illumination of the Moon

The following table depicts the illumination of the Moon, calculated at 00:00, throughtout the 30 days of September 2011.

September 2011
wMondayTuesdayWednesdayThursdayFridaySaturdaySunday
Week 35
29 Monday
 
30 Tuesday
 
31 Wednesday
 
1Thursday
 
13.1% illuminated
Age: 3.5
2Friday
 
22.2% illuminated
Age: 4.6
3Saturday
 
32.6% illuminated
Age: 5.7
4Sunday
 
43.6% illuminated
Age: 6.8
Week 36
5Monday
 
54.7% illuminated
Age: 7.8
6Tuesday
 
65.3% illuminated
Age: 8.8
7Wednesday
 
75% illuminated
Age: 9.8
8Thursday
 
83.4% illuminated
Age: 10.8
9Friday
 
90.2% illuminated
Age: 11.8
10Saturday
 
95.3% illuminated
Age: 12.7
11Sunday
 
98.6% illuminated
Age: 13.6
Week 37
12Monday
 
100% illuminated
Age: 14.6
13Tuesday
 
99.4% illuminated
Age: 15.5
14Wednesday
 
97.1% illuminated
Age: 16.4
15Thursday
 
93.1% illuminated
Age: 17.3
16Friday
 
87.6% illuminated
Age: 18.2
17Saturday
 
80.7% illuminated
Age: 19
18Sunday
 
72.6% illuminated
Age: 19.9
Week 38
19Monday
 
63.6% illuminated
Age: 20.9
20Tuesday
 
53.9% illuminated
Age: 21.8
21Wednesday
 
43.8% illuminated
Age: 22.7
22Thursday
 
33.7% illuminated
Age: 23.7
23Friday
 
23.9% illuminated
Age: 24.7
24Saturday
 
15% illuminated
Age: 25.8
25Sunday
 
7.7% illuminated
Age: 26.9
Week 39
26Monday
 
2.6% illuminated
Age: 28
27Tuesday
 
0.1% illuminated
Age: 29.2
28Wednesday
 
0.7% illuminated
Age: 0.8
29Thursday
 
4.4% illuminated
Age: 2
30Friday
 
10.7% illuminated
Age: 3.1
1 Saturday
 
2 Sunday
 
3 Monday
 
4 Tuesday
 
5 Wednesday
 
6 Thursday
 
7 Friday
 
8 Saturday
 
9 Sunday
 
10 Monday
 
11 Tuesday
 
12 Wednesday
 
13 Thursday
 
14 Friday
 
15 Saturday
 
16 Sunday
 
Content last updated on 2018-10-21T17:33:00Z