The Earths Moon Motions of Earths Moon Revolution

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The Earth’s Moon

The Earth’s Moon

Motions of Earth’s Moon Revolution of the moon around Earth affects: phases of the

Motions of Earth’s Moon Revolution of the moon around Earth affects: phases of the moon, tides and eclipses l The moon’s orbit is tilted at 5 degrees l The moon’s period of revolution is 27. 5 days l The moon rotates at the same speed that it revolves, so the same side of the moon is always facing Earth l

Phases The moon rises 50 minutes later each day l Half of the moon

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

WHEN IN DOUBT, CHECK IT OUT! ESRT page 15

WHEN IN DOUBT, CHECK IT OUT! ESRT page 15

Moon Phase Time in days for one phase cycle Tides (spring or neap) Eclipse

Moon Phase Time in days for one phase cycle Tides (spring or neap) Eclipse Possible? 1. New 0 Spring Yes, Lunar 2. New crescent 3. 75 3. First quarter (half) 7. 5 4. New gibbous 11. 25 5. Full 14. 5 6. Old gibbous 18. 5 7. Third quarter (half) 22. 5 8. Old cresent 26 1. New 29. 5 No Neap No No Spring Yes, Solar No Neap No No Spring Yes, Lunar Phases of the Moon

It takes 1 week to go from new to 1 st quarter, 1 week

It takes 1 week to go from new to 1 st quarter, 1 week to go from 1 st quarter to full (or 2 weeks total), etc l It takes 29. 5 days for the moon to go from the new moon phase, through all of the other phases, back to the new moon phasel It is 2 days longer than period of revolution because as the moon orbits Earth, Earth is moving by orbiting the sun l

Vids Moon Phases l Phases again l Falling Moon l How the Moon Formed

Vids Moon Phases l Phases again l Falling Moon l How the Moon Formed l

l Tides: The cyclic rise and fall of ocean waters due to the gravitation

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

Spring Tides / Neap Tides Spring Tides: When the highest high tides and the

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 l This is due to the sun and the moon pulling in the same line l Neap Tides: Least amount of change between high tide and low tide- occurs during the first and last quarter phases of the moon l

l. The sun is larger, but the moon is closer, so the moon has

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