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What is the reason that the moon is sometimes completely round and sometimes half-moon shaped? - Quora
Lunar Phases and Eclipses
Why do we sometimes see a crescent moon during the day? - Quora
Why can I sometimes see a horizontal half moon instead of a vertical one? - Quora
How does a half moon happen? - Quora
Quarter moon or a half moon?, Moon Phases
Part 1: Lunar Phases Imaging the Universe - The University of Iowa
half moon
Why the moon is sometimes full and sometimes half or invisible? - Quora
Why can I see the whole moon during various non-full-moon phases? - Quora