The Earths Moon Motions of Earths Moon Revolution
- Slides: 16
The Earth’s Moon
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 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
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 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 l
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 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 a much greater effect on the tides
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- Home.hiwaay.net/ krcool/astro/moon/moon tides/