Moon Phase Calculator

Use the Home link to return to the home page. Do not use the back button.
Observer Desired Local Time - Valid year range is 2000 - 2036
Year: Month: Day: Time Zone:
Today is Sun, Dec 16, 2018 the moon is 10 days old, 64% illuminated and increasing.
PhaseLunation 234Lunation 235Lunation 236
New Moon Fri, Dec 7, 2018 2:21 AMSat, Jan 5, 2019 8:29 PMMon, Feb 4, 2019 4:04 PM
Waxing Crescent Moon Tue, Dec 11, 2018 4:36 AMWed, Jan 9, 2019 11:08 PMFri, Feb 8, 2019 4:45 PM
First Quarter Moon Sat, Dec 15, 2018 6:50 AMMon, Jan 14, 2019 1:46 AMTue, Feb 12, 2019 5:27 PM
Waxing Gibbous Moon Tue, Dec 18, 2018 9:50 PMThu, Jan 17, 2019 1:01 PMSat, Feb 16, 2019 2:10 AM
Full Moon Sat, Dec 22, 2018 12:49 PMMon, Jan 21, 2019 12:17 AMTue, Feb 19, 2019 10:54 AM
Waning Gibbous Moon Tue, Dec 25, 2018 8:42 PMThu, Jan 24, 2019 8:14 AMFri, Feb 22, 2019 8:41 PM
Third Quarter Moon Sat, Dec 29, 2018 4:35 AMSun, Jan 27, 2019 4:11 PMTue, Feb 26, 2019 6:28 AM
Waning Crescent Moon Wed, Jan 2, 2019 12:32 AMThu, Jan 31, 2019 4:08 PMSat, Mar 2, 2019 3:14 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).