What causes moon phases? Why is there only one full moon a month?
How did Ptolemy’s model account for retrograde motion?
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August 4, 2020What causes moon phases? Why is there only one full moon a month?
Both Moon’s day-night spin-period and its orbital period around Earth are the same 29.53 d and the same hemisphere faces Earth. The gradual day-night transit across this face is observed in phases.
During this period Moon appears alternately in the (Earth-Moon-Sun) Sun side and (Moon-Earth-Sun) opposite side. While in the Sun-side we see dark Moon. On the opposite side the face we see is wholly sunlit and it is full Moon. This period 29.53 d is the time between two successive Full Moons At New Moon and Full Moon the Moon crosses the heliocentric (moving) longitudinal plane of . .
