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, Apr 20, 2021 the moon is 9 days old, 55% illuminated and increasing.
PhaseLunation 263Lunation 264Lunation 265
New Moon Sun, Apr 11, 2021 9:31 PMTue, May 11, 2021 2:00 PMThu, Jun 10, 2021 5:53 AM
Waxing Crescent Moon Thu, Apr 15, 2021 11:46 PMSat, May 15, 2021 2:07 PMMon, Jun 14, 2021 2:24 AM
First Quarter Moon Tue, Apr 20, 2021 2:00 AMWed, May 19, 2021 2:13 PMThu, Jun 17, 2021 10:55 PM
Waxing Gibbous Moon Fri, Apr 23, 2021 12:16 PMSat, May 22, 2021 10:14 PMMon, Jun 21, 2021 6:18 AM
Full Moon Mon, Apr 26, 2021 10:32 PMWed, May 26, 2021 6:15 AMThu, Jun 24, 2021 1:40 PM
Waning Gibbous Moon Fri, Apr 30, 2021 6:41 AMSat, May 29, 2021 4:20 PMMon, Jun 28, 2021 2:56 AM
Third Quarter Moon Mon, May 3, 2021 2:51 PMWed, Jun 2, 2021 2:25 AMThu, Jul 1, 2021 4:11 PM
Waning Crescent Moon Fri, May 7, 2021 2:26 PMSun, Jun 6, 2021 4:09 AMMon, Jul 5, 2021 8:05 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).