Do all astronomers use the same method(s) for calculating astronomical new moon? If not, what are the differences?
There are different algorithms to calculate astronomical new moon (conjunction time) depending upon accuracy desired. Some are more accurate than others. Less elaborate and sufficiently accurate formulae can calculate the time of birth of new moon with an error up to +2 or -2 minutes, and for most practical purposes this accuracy is sufficient. 7.9 Question: It is known that the orbit of moon around the earth is oval in shape. The moon comes closer to the earth, and then it goes away from the earth. Does the phase of new moon’s birth occur when it is at closer point to the earth or when it is at farthest point from the earth, or does it change from month to month? (Dec 30, 1998) Answer: When new moon birth takes place, moon may be anywhere between closest to farthest point from the earth. It is at a different position in its orbit every month when the birth takes place, i.e., when the conjunction occurs. So, it changes from month to month.
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