Moon Phase Calculator

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Observer Desired Local Time - Valid year range is 2000 - 2036
Year: Month: Day: Time Zone:
Today is Sat, Oct 21, 2017 the moon is 3 days old, 6% illuminated and increasing.
PhaseLunation 220Lunation 221Lunation 222
New Moon Thu, Oct 19, 2017 2:13 PMSat, Nov 18, 2017 6:43 AMMon, Dec 18, 2017 1:31 AM
Waxing Crescent Moon Mon, Oct 23, 2017 3:48 PMWed, Nov 22, 2017 9:23 AMFri, Dec 22, 2017 2:56 AM
First Quarter Moon Fri, Oct 27, 2017 5:23 PMSun, Nov 26, 2017 12:04 PMTue, Dec 26, 2017 4:21 AM
Waxing Gibbous Moon Tue, Oct 31, 2017 8:53 AMWed, Nov 29, 2017 11:26 PMFri, Dec 29, 2017 12:53 PM
Full Moon Sat, Nov 4, 2017 12:24 AMSun, Dec 3, 2017 10:48 AMMon, Jan 1, 2018 9:25 PM
Waning Gibbous Moon Tue, Nov 7, 2017 8:00 AMWed, Dec 6, 2017 6:50 PMFri, Jan 5, 2018 7:25 AM
Third Quarter Moon Fri, Nov 10, 2017 3:37 PMSun, Dec 10, 2017 2:52 AMMon, Jan 8, 2018 5:26 PM
Waning Crescent Moon Tue, Nov 14, 2017 11:10 AMThu, Dec 14, 2017 2:12 AMFri, Jan 12, 2018 8:43 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).