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Let and represent the ecliptic longitudes
of the sun and the moon, respectively. The lunar-solar elongation is defined
Since the moon is only visible because of light reflected from the sun, there is a fairly obvious relationship between lunar-solar elongation and lunar
phase--see Fig. 26. For instance, a new moon corresponds to
, a quarter moon to or , and a full moon to . New moons and full moons are collectively known as lunar-solar syzygies.
The phases of the moon.