#half-moon the time at which the moon is at first or last quarter when half its face is illuminated
supertype: phase_of_the_moon a time when the moon presents a particular recurring appearance
subtype: first_quarter last_quarter
part of: month a time unit of 30 days; "he was given a month to pay the bill"
part of: year a period of time occupying a regular part of a calendar year that is used for some particular activity; "a school year"
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