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, Jan 19, 2021 the moon is 7 days old, 42% illuminated and increasing.
PhaseLunation 260Lunation 261Lunation 262
New Moon Wed, Jan 13, 2021 12:01 AMThu, Feb 11, 2021 2:06 PMSat, Mar 13, 2021 5:22 AM
Waxing Crescent Moon Sat, Jan 16, 2021 8:02 PMMon, Feb 15, 2021 1:57 PMWed, Mar 17, 2021 7:31 AM
First Quarter Moon Wed, Jan 20, 2021 4:02 PMFri, Feb 19, 2021 1:48 PMSun, Mar 21, 2021 9:41 AM
Waxing Gibbous Moon Sun, Jan 24, 2021 3:10 PMTue, Feb 23, 2021 8:33 AMWed, Mar 24, 2021 11:45 PM
Full Moon Thu, Jan 28, 2021 2:17 PMSat, Feb 27, 2021 3:18 AMSun, Mar 28, 2021 1:49 PM
Waning Gibbous Moon Mon, Feb 1, 2021 1:27 AMTue, Mar 2, 2021 11:54 AMWed, Mar 31, 2021 9:26 PM
Third Quarter Moon Thu, Feb 4, 2021 12:38 PMFri, Mar 5, 2021 8:31 PMSun, Apr 4, 2021 5:03 AM
Waning Crescent Moon Mon, Feb 8, 2021 1:22 AMTue, Mar 9, 2021 12:56 PMWed, Apr 7, 2021 2:31 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).