Moon Phase Calculator

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Observer Desired Local Time - Valid year range is 2000 - 2036
Year: Month: Day: Time Zone:
Today is Mon, Sep 21, 2020 the moon is 4 days old, 23% illuminated and increasing.
PhaseLunation 256Lunation 257Lunation 258
New Moon Thu, Sep 17, 2020 6:01 AMFri, Oct 16, 2020 2:32 PMSun, Nov 15, 2020 12:08 AM
Waxing Crescent Moon Sun, Sep 20, 2020 1:28 PMMon, Oct 19, 2020 11:28 PMWed, Nov 18, 2020 11:57 AM
First Quarter Moon Wed, Sep 23, 2020 8:56 PMFri, Oct 23, 2020 8:24 AMSat, Nov 21, 2020 11:46 PM
Waxing Gibbous Moon Sun, Sep 27, 2020 6:31 PMTue, Oct 27, 2020 9:07 AMThu, Nov 26, 2020 2:08 AM
Full Moon Thu, Oct 1, 2020 4:06 PMSat, Oct 31, 2020 9:50 AMMon, Nov 30, 2020 4:30 AM
Waning Gibbous Moon Mon, Oct 5, 2020 5:53 PMWed, Nov 4, 2020 9:18 AMFri, Dec 4, 2020 12:04 AM
Third Quarter Moon Fri, Oct 9, 2020 7:40 PMSun, Nov 8, 2020 8:47 AMMon, Dec 7, 2020 7:37 PM
Waning Crescent Moon Tue, Oct 13, 2020 5:06 AMWed, Nov 11, 2020 4:27 PMThu, Dec 10, 2020 9:48 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).