Posted by nadia 1 year ago In:

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nadia
nadia Asked:

I need it for my science class

How long does it take the moon to complete an entire phase change?thanks Cool

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John McCann
John McCann Answered:

 

 

http://en.wikipedia.org/wiki/New_moon#Determining_new_moons:_an_approximate_formula

 

 

 

 

If you are in a science class you need to learn how do do your own research. Get to it!

" Reality is that which exists outside of your beliefs. "
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Mountainboy19682
Mountainboy19682 Answered:

Lunar months are quite variable in length for several reasons including the fact that the earths orbit around the sun is elliptical and not circular. According to the web page http://scienceworld.wolfram.com/astronomy/Lunation.html

between 1900 and 2100 the lunation or period between new moons will have varied from 29 days 6 hours and 35 minutes and 29 days 19 hours and 55 minutes. The figure usually given for the mean length of a lunar month is 19 days 12 hours and 43 minutes.

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Vince
Vince Answered:

There isn't an exact answer. The moons position is one of the hardest to

calculate.  Google"lunar ephemerides" and "evection".

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