Moon Phase Calculator

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Observer Desired Local Time - Valid year range is 2000 - 2036
Year: Month: Day: Time Zone:
Today is Tue, Aug 21, 2018 the moon is 11 days old, 82% illuminated and increasing.
PhaseLunation 230Lunation 231Lunation 232
New Moon Sat, Aug 11, 2018 4:58 AMSun, Sep 9, 2018 1:02 PMMon, Oct 8, 2018 10:48 PM
Waxing Crescent Moon Tue, Aug 14, 2018 3:54 PMThu, Sep 13, 2018 3:39 AMFri, Oct 12, 2018 5:55 PM
First Quarter Moon Sat, Aug 18, 2018 2:49 AMSun, Sep 16, 2018 6:16 PMTue, Oct 16, 2018 1:03 PM
Waxing Gibbous Moon Wed, Aug 22, 2018 4:53 AMThu, Sep 20, 2018 8:04 PMSat, Oct 20, 2018 12:24 PM
Full Moon Sun, Aug 26, 2018 6:57 AMMon, Sep 24, 2018 9:53 PMWed, Oct 24, 2018 11:46 AM
Waning Gibbous Moon Thu, Aug 30, 2018 2:17 AMFri, Sep 28, 2018 1:20 PMSat, Oct 27, 2018 11:43 PM
Third Quarter Moon Sun, Sep 2, 2018 9:38 PMTue, Oct 2, 2018 4:46 AMWed, Oct 31, 2018 11:41 AM
Waning Crescent Moon Thu, Sep 6, 2018 5:20 AMFri, Oct 5, 2018 1:47 PMSat, Nov 3, 2018 5:50 PM


Notes:
1. Use the Home link to return to the home page. Do not use the back button.
2. If more precise information is needed NASA has exact eclipse and moon phase data worked out for the entire century.
3. Time Zone is the number of hours the local time zone is offset from UTC(GMT), negative to the west and positive to the east.
Standard times are EST=-5, CST=-6, MST=-7 and PST=-8.
Daylight times are EDT=-4, CDT=-5, MDT=-6 and PDT=-7.
4. Lunation count starts with the first new moon in 2000 (1/6/2000) equals zero. Brown's Lunation Number is 953 greater.
5. Based on an algorithm developed by Jean Meeus (Astronomical Algorithms 1998).