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See the last quarter moon tonight (Sept. 17)



On Saturday (Sept. 17) the moon will enter the stage of its phase called the last quarter  —  also called the third quarter  —  during which time it will be half-illuminated as seen from Earth.

Both the last quarter and the third quarter may be confusing names for this stage initially as the moon is half illuminated, but they actually refer to the fact that the moon has completed 3/4 of its orbit around Earth at this point.





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