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Math Calculation for Moon Phases

           Moon Phases


The date/time of moon age and the next four major lunar phases are in Universal Time (Greenwich Time, longitude=0).  To convert date/time of lunar phases to your local time zone is to add the date/time with your time zone hour number. For example,

New moon date/time is 6-13-99 19:03 at UT.

If PST (time zone = - 8), the new moon date/time is 6-13-1999 11:03, after subtracting 8 hours
If EST (time zone = - 5), the new moon date/time is 6-13-1999 14:03, after subtracting 5 hours.
If China (time zone = 8), the new moon date/time is 6-14-1999 03:03, after adding 8 hours.
 

Because new moon day is the first day of a Chinese lunar month, therefore Chinese lunar month for June 1999 using in USA time zones are different from the one using in China time zone.

 

Daylight saving Time need to be adjusted for one hour
If PDT (time zone = - 8) , the new moon date/time is 6-13-1999 12:03, after subtracting 7 hours
If EDT (time zone = - 5) , the new moon date/time is 6-13-1999 15:03, after subtracting 4 hours.

 


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