Author Topic: Moon Age  (Read 330 times)

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Offline marshad

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Moon Age
« on: August 10, 2019, 06:48:44 AM »
I know a lot of you include sun/moon ephemeris on your sites.

An interesting thing is that most of the sites I look at which give Moon age in days are wrong, and usually wrong by the same amount +0.8 days.

It is not a difficult thing to calculate - it is just the amount of time since the last New Moon. If you want to check it:

https://svs.gsfc.nasa.gov/4442

Has anybody else noticed this? And does it mean that there is an algorithm out there in common usage which is wrong?

Or am I missing something? (Highly likely!)

http://moonappreciationsociety.com/Meteo/VillarPerosa/index.php

 

anything