Moon Phase Calculator

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Observer Desired Local Time - Valid year range is 2000 - 2036
Year: Month: Day: Time Zone:
Today is Thu, Sep 23, 2021 the moon is 17 days old, 91% illuminated and decreasing.
PhaseLunation 268Lunation 269Lunation 270
New Moon Mon, Sep 6, 2021 7:52 PMWed, Oct 6, 2021 6:06 AMThu, Nov 4, 2021 4:15 PM
Waxing Crescent Moon Fri, Sep 10, 2021 5:46 AMSat, Oct 9, 2021 2:16 PMMon, Nov 8, 2021 12:01 AM
First Quarter Moon Mon, Sep 13, 2021 3:40 PMTue, Oct 12, 2021 10:26 PMThu, Nov 11, 2021 7:47 AM
Waxing Gibbous Moon Fri, Sep 17, 2021 5:18 AMSat, Oct 16, 2021 4:12 PMMon, Nov 15, 2021 5:53 AM
Full Moon Mon, Sep 20, 2021 6:55 PMWed, Oct 20, 2021 9:57 AMFri, Nov 19, 2021 3:58 AM
Waning Gibbous Moon Fri, Sep 24, 2021 7:57 PMSun, Oct 24, 2021 12:32 PMTue, Nov 23, 2021 5:43 AM
Third Quarter Moon Tue, Sep 28, 2021 8:58 PMThu, Oct 28, 2021 3:06 PMSat, Nov 27, 2021 7:28 AM
Waning Crescent Moon Sat, Oct 2, 2021 1:32 PMMon, Nov 1, 2021 3:41 AMTue, Nov 30, 2021 3:44 AM


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).