New Moon Calculator
 This page runs a Javascript program which takes the current time and date, calculates the approximate time and date of the last previous and next new Moon. And there is more.

According to your computer clock it is Mon Apr 07 2025 16:07:38 GMT+0000 (Coordinated Universal Time)

The last New Moon was 10 hours 59 minutes U.T. March 29, 2025
The Moon is currently 9.21 days old.
The next New Moon is 19 hours 32 minutes U.T. April 27, 2025

You can enter a date in the boxes at the right and click the Calculate button. The program will calculate the date and time (plus minus a few minutes for dates from 2000 B.C. to 2100 A.D.) of the New Moon close to the date you enter. ClearEntries before you enter a new date.  Year = Month = Day = 

The New Moon close to this date is: 
Year = Month = Day = 
Approximate time:hoursminutes U.T. 

 
Astronomers use a dating system which include the year zero and years before zero are negative while those after are positive. Historians use a dating system where there is no zero year and there is a B.C. and A.D. Thus, the year "0" here corresponds to "1 B.C.", and the year "-100" is "101 B.C.", etc..

This calculation is performed using an algrorithm found in Astronomical Algorithms, 2nd edition by Jean Meeus, December 1998,Willmann-Bell, ISBN: 0943396611.

If you would  like to compare this calculation with slightly more accurate calculations of the phases
of the Moon you can consult the Five Millennia Catalog of Phases of the Moon compiled by
NASA's Fred Espenak.

The animated gif of the phases of the moon was made by Ed Stephan using photographs from the U.S. Naval Observatory. This text and program © 2000 by C. Hartley , Department of Physics,  Hartwick College.