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 4, 2020 the moon is 15 days old, 98% illuminated and decreasing.
PhaseLunation 254Lunation 255Lunation 256
New Moon Mon, Jul 20, 2020 12:33 PMTue, Aug 18, 2020 9:42 PMThu, Sep 17, 2020 6:01 AM
Waxing Crescent Moon Thu, Jul 23, 2020 10:03 PMSat, Aug 22, 2020 5:20 AMSun, Sep 20, 2020 1:28 PM
First Quarter Moon Mon, Jul 27, 2020 7:33 AMTue, Aug 25, 2020 12:58 PMWed, Sep 23, 2020 8:56 PM
Waxing Gibbous Moon Thu, Jul 30, 2020 9:16 PMSat, Aug 29, 2020 6:40 AMSun, Sep 27, 2020 6:31 PM
Full Moon Mon, Aug 3, 2020 10:59 AMWed, Sep 2, 2020 12:23 AMThu, Oct 1, 2020 4:06 PM
Waning Gibbous Moon Fri, Aug 7, 2020 11:22 AMSun, Sep 6, 2020 2:25 AMMon, Oct 5, 2020 5:53 PM
Third Quarter Moon Tue, Aug 11, 2020 11:45 AMThu, Sep 10, 2020 4:26 AMFri, Oct 9, 2020 7:40 PM
Waning Crescent Moon Sat, Aug 15, 2020 4:44 AMSun, Sep 13, 2020 5:13 PMMon, Oct 12, 2020 9:50 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).