Moon Phase Calculator

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Observer Desired Local Time - Valid year range is 2000 - 2036
Year: Month: Day: Time Zone:
Today is Wed, Aug 21, 2019 the moon is 21 days old, 64% illuminated and decreasing.
PhaseLunation 242Lunation 243Lunation 244
New Moon Wed, Jul 31, 2019 10:12 PMFri, Aug 30, 2019 5:38 AMSat, Sep 28, 2019 1:27 PM
Waxing Crescent Moon Sun, Aug 4, 2019 5:22 AMMon, Sep 2, 2019 1:54 PMWed, Oct 2, 2019 12:37 AM
First Quarter Moon Wed, Aug 7, 2019 12:32 PMThu, Sep 5, 2019 10:11 PMSat, Oct 5, 2019 11:48 AM
Waxing Gibbous Moon Sun, Aug 11, 2019 10:01 AMMon, Sep 9, 2019 10:52 PMWed, Oct 9, 2019 1:58 PM
Full Moon Thu, Aug 15, 2019 7:30 AMFri, Sep 13, 2019 11:34 PMSun, Oct 13, 2019 4:09 PM
Waning Gibbous Moon Mon, Aug 19, 2019 8:43 AMTue, Sep 17, 2019 10:38 PMThu, Oct 17, 2019 11:54 AM
Third Quarter Moon Fri, Aug 23, 2019 9:57 AMSat, Sep 21, 2019 9:42 PMMon, Oct 21, 2019 7:40 AM
Waning Crescent Moon Mon, Aug 26, 2019 7:47 PMWed, Sep 25, 2019 5:34 AMThu, Oct 24, 2019 3:50 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).