Cycles of the Sky Chapter 3:. The Tidally Locked Orbit of the Moon The moon is rotating with the same period around its axis as it is orbiting Earth (tidally.

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Presentation transcript:

Cycles of the Sky Chapter 3:

The Tidally Locked Orbit of the Moon The moon is rotating with the same period around its axis as it is orbiting Earth (tidally locked). We always see the same side of the moon facing Earth.

The Phases of the Moon (II) New Moon → First Quarter → Full Moon Evening Sky

The Phases of the Moon (III) Full Moon → Third Quarter → New Moon Morning Sky

The Orbit of the Moon (I) The Moon orbits Earth in a sidereal period of days days EarthMoon Fixed direction in space

The Orbit of the Moon (II) The moon’s synodic period (to reach the same position relative to the sun) is days (~ 1 month). Fixed direction in space Earth Moon Earth orbits around Sun => Direction toward Sun changes! days