last quarter

last quarter

noun Astronomy.
the instant, approximately one week after a full moon, when half of the moon's disk is illuminated by the sun.
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Last quarter is always a great word to know.
So is apparent magnitude. Does it mean:
the partial or imperfect shadow outside the complete shadow of an opaque body, such as a planet, where the light from the source of illumination is only partly cut off
the magnitude or brightness of a star as it appears to an observer on the earth
Collins
World English Dictionary
last quarter
 
n
Compare first quarter one of the four principal phases of the moon, occurring between full moon and new moon, when half the lighted surface is visible

Collins English Dictionary - Complete & Unabridged 10th Edition
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