Moon Phase Calculator

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Observer Desired Local Time - Valid year range is 2000 - 2036
Year: Month: Day: Time Zone:
Today is Sun, Dec 17, 2017 the moon is -0 days old, 0% illuminated and decreasing.
PhaseLunation 222Lunation 223Lunation 224
New Moon Mon, Dec 18, 2017 1:31 AMTue, Jan 16, 2018 9:18 PMThu, Feb 15, 2018 4:06 PM
Waxing Crescent Moon Fri, Dec 22, 2017 2:56 AMSat, Jan 20, 2018 7:19 PMMon, Feb 19, 2018 9:38 AM
First Quarter Moon Tue, Dec 26, 2017 4:21 AMWed, Jan 24, 2018 5:21 PMFri, Feb 23, 2018 3:10 AM
Waxing Gibbous Moon Fri, Dec 29, 2017 12:53 PMSun, Jan 28, 2018 12:54 AMMon, Feb 26, 2018 11:31 AM
Full Moon Mon, Jan 1, 2018 9:25 PMWed, Jan 31, 2018 8:27 AMThu, Mar 1, 2018 7:52 PM
Waning Gibbous Moon Fri, Jan 5, 2018 7:25 AMSat, Feb 3, 2018 9:41 PMMon, Mar 5, 2018 1:06 PM
Third Quarter Moon Mon, Jan 8, 2018 5:26 PMWed, Feb 7, 2018 10:55 AMFri, Mar 9, 2018 6:21 AM
Waning Crescent Moon Fri, Jan 12, 2018 7:22 PMSun, Feb 11, 2018 1:30 PMTue, Mar 13, 2018 3:10 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).