Moon Phase Calculator

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Observer Desired Local Time - Valid year range is 2000 - 2036
Year: Month: Day: Time Zone:
Today is Thu, Oct 18, 2018 the moon is 10 days old, 73% illuminated and increasing.
PhaseLunation 232Lunation 233Lunation 234
New Moon Mon, Oct 8, 2018 10:48 PMWed, Nov 7, 2018 11:03 AMFri, Dec 7, 2018 2:21 AM
Waxing Crescent Moon Fri, Oct 12, 2018 5:55 PMSun, Nov 11, 2018 10:29 AMTue, Dec 11, 2018 4:36 AM
First Quarter Moon Tue, Oct 16, 2018 1:03 PMThu, Nov 15, 2018 9:55 AMSat, Dec 15, 2018 6:50 AM
Waxing Gibbous Moon Sat, Oct 20, 2018 12:24 PMMon, Nov 19, 2018 5:17 AMTue, Dec 18, 2018 9:50 PM
Full Moon Wed, Oct 24, 2018 11:46 AMFri, Nov 23, 2018 12:40 AMSat, Dec 22, 2018 12:49 PM
Waning Gibbous Moon Sat, Oct 27, 2018 11:43 PMMon, Nov 26, 2018 10:00 AMTue, Dec 25, 2018 8:42 PM
Third Quarter Moon Wed, Oct 31, 2018 11:41 AMThu, Nov 29, 2018 7:20 PMSat, Dec 29, 2018 4:35 AM
Waning Crescent Moon Sat, Nov 3, 2018 11:22 PMMon, Dec 3, 2018 10:50 AMTue, Jan 1, 2019 2:17 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).