Title: The Earth
1The Earths Moon
2Motions of Earths Moon
- Revolution of the moon around Earth affects
phases of the moon, tides and eclipses - The moons orbit is tilted at 5 degrees
- The moons 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
3Phases
- The moon rises 50 minutes later each day
- Half of the moon is always lit (except during a
lunar eclipse) due to the light from the sun - Depending on where the moon is in its orbit,
observers on Earth see varying amounts of the
lighted half
4WHEN IN DOUBT, CHECK IT OUT! ESRT page 15
5Phases of the Moon
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 No
3. First quarter (half) 7.5 Neap No
4. New gibbous 11.25 No
5. Full 14.5 Spring Yes, Solar
6. Old gibbous 18.5 No
7. Third quarter (half) 22.5 Neap No
8. Old cresent 26 No
1. New 29.5 Spring Yes, Lunar
6- It takes 1 week to go from new to 1st quarter, 1
week to go from 1st quarter to full (or 2 weeks
total), etc - 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 phase- - It is 2 days longer than period of revolution
because as the moon orbits Earth, Earth is moving
by orbiting the sun
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8Vids
- Moon Phases
- Phases again
- Falling Moon
- How the Moon Formed
9Tides
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12- Tides The cyclic rise and fall of ocean waters
due to the gravitation between the Earth, the
moon and the sun
13Spring 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 - This is due to the sun and the moon pulling in
the same line - Neap Tides Least amount of change between high
tide and low tide- occurs during the first and
last quarter phases of the moon
14- The sun is larger, but the moon is closer, so the
moon has a much greater effect on the tides
15Based on the diagram, which types of tides have
a larger range?
SPRING TIDES
16There are not exactly 12 hours between high
tides because the moon revolves around the
Earth while the Earth rotates