New moon
First quarter
Full moon
Last quarter
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This is the phenomenon and the time when the celestial longitude of
the moon is equal to the celestial longitude of the sun.
This is the phenomenon and the time when the celestial longitude of
the moon is 90° greater (or 270° smaller) than the celestial longitude of
the sun.
This is the phenomenon and the time when the celestial longitude of
the moon is 180° greater (or 180° smaller) than the celestial longitude of
the sun.
This is the phenomenon and the time when the celestial longitude of
the moon is 270° greater (or 90° smaller) than the celestial longitude of
the sun.