1. The Earth’s Moon

2. Motions of Earth’s Moon Revolution of the moon around Earth affects: phases of the moon, tides and eclipses Revolution of the moon around Earth affects: phases of the moon, tides and eclipses The moon’s orbit is tilted at 5 degrees The moon’s orbit is tilted at 5 degrees The moon’s period of revolution is 27.5 days The moon’s period of revolution is 27.5 days The moon rotates at the same speed that it revolves, so the same side of the moon is always facing Earth The moon rotates at the same speed that it revolves, so the same side of the moon is always facing Earth

3. Phases The moon rises 50 minutes later each day The moon rises 50 minutes later each day Half of the moon is always lit, due to the light from the sun (except during a lunar eclipse) Half of the moon is always lit, due to the light from the sun (except during a lunar eclipse) Depending on where the moon is in it’s orbit, observers on Earth see varying amounts of the lighted half Depending on where the moon is in it’s orbit, observers on Earth see varying amounts of the lighted half

4. WHEN IN DOUBT, CHECK IT OUT! ESRT page 15

5. Phases of the Moon Moon PhaseTime in days for one phase cycle Tides (spring or neap) Eclipse Possible? 1. New0SpringYes, Lunar 2. New crescent3.75No 3. First quarter (half) 7.5NeapNo 4. New gibbous11.25No 5. Full14.5SpringYes, Solar 6. Old gibbous18.5No 7. Third quarter (half) 22.5NeapNo 8. Old cresent26No 1. New29.5SpringYes, Lunar 29.5 days equals the time it takes for the moon to go from the new moon phase, through all of the other phases, back to the new moon phase->Longer than period of revolution because as the moon orbits Earth, Earth is moving by orbiting the sun

7. Vids Moon Phases Moon Phases Moon Phases Moon Phases Phases again Phases again Phases again Phases again Falling Moon Falling Moon Falling Moon Falling Moon How the Moon Formed How the Moon Formed How the Moon Formed How the Moon Formed

11. Tides: The cyclic rise and fall of ocean waters due to the gravitation between the Earth, the moon and the sun Tides: The cyclic rise and fall of ocean waters due to the gravitation between the Earth, the moon and the sun

12. Spring Tides / Neap Tides Spring Tides: When the highest high tides and the lowest low tides occur, which happens near the full and new moon phases Spring Tides: When the highest high tides and the lowest low tides occur, which happens near the full and new moon phases This is due to the sun and the moon pull in the same line This is due to the sun and the moon pull in the same line Neap Tides: Least amount of change between high tide and low tide- occurs when the sun and the moon are at a right angle, during the first and last quarter phases of the moon Neap Tides: Least amount of change between high tide and low tide- occurs when the sun and the moon are at a right angle, during the first and last quarter phases of the moon

13. The sun is larger, but the moon is closer, so the moon has a much greater effect on the tides The sun is larger, but the moon is closer, so the moon has a much greater effect on the tides