The sun always illuminates half of the moon’s surface, except during a lunar eclipse. The illuminated portion of the moon visible from Earth varies as it revolves around Earth resulting in the phases of the moon. The period from a full moon to a new moon and back to a full moon is called a synodic month and is 29 days, 12 hours, and 44.05 minutes long. Write a sine function that models the fraction of the moon’s surface which is seen to be illuminated during a synodic month as a function of the number of days, d, after a full moon. [Note: full moon equals 1/2 illuminated.] I'm lost.

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Ultrilliam · Answer

moved to Astronomy.

psirockin3 · Answer

http://openstudy.com/updates/5116fc15e4b09e16c5c89101 This explained how to do it. Sorry