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Moon, Eclipses, and Tides

Moon, Eclipses, and Tides. Ms. Wood. General Moon Info. Moon’s rotation 27.3 days Moon’s revolution around Earth – 27.3 days Same side of moon always faces earth hence “dark side of the moon” One day on moon = one year on moon Moon reflects sunlight

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Moon, Eclipses, and Tides

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  1. Moon, Eclipses, and Tides Ms. Wood

  2. General Moon Info • Moon’s rotation 27.3 days • Moon’s revolution around Earth – 27.3 days • Same side of moon always faces earth hence “dark side of the moon” • One day on moon = one year on moon • Moon reflects sunlight • 1959 - first time people saw far side of moon thanks to Soviet Luna 3 • From the moon, Earth goes through phases

  3. Moon Phases • Different shapes of moon are called phases • Moon goes through phases in one month • Phases are due to changing relative positions of moon, earth, and sun • New moon • Waxing Crescent • First Quarter • Waxing Gibbous • Full Moon • Waning Gibbous • Third Quarter • Waning Crescent

  4. Eclipses • Definition: Partial or total blocking of one object by another • Solar eclipse – blocking of sunlight to Earth that occurs because the moon is between Earth and the sun • Solar eclipse is like a new moon because it blocks the view of the sun • Only people in umbra can experience total solar eclipse – see stars and corona (atmosphere of sun) • Umbra – The darkest part of a shadow • Partial eclipse can be seen in penumbra • Penumbra – The part of a shadow surrounding the darkest part • Occur in new moon

  5. Eclipses • Lunar eclipses – the blocking of sunlight to the moon because the Earth is between the moon and the sun • Lunar eclipses are much more popular • Eclipse seasons can help astronomers predict eclipses • Occur in full moon

  6. Tides • Definition: The rise and fall of the level of water in the ocean • 6 hours rise; 6 hours fall • Caused by Moon’s gravitational pull on earth • 2 high tides on earth at once • Low tide is from areas between the high tides • 25 hour cycle of 2 high and 2 low tides

  7. More Tides • Shapes of bays, inlets, and ocean floor effect tides • Neap tide – A tide with the least difference between high and low tides • The sun and moon pull in opposite directions • Spring tide –A tide with the greatest difference between low and high tides • The sun and moon pull in the same direction

  8. And Even More Tides • Intertidal zone – under water in high tide but exposed at low tide • http://www.youtube.com/watch?v=l37ofe9haMU • Animals here have: • Constantly changing conditions • Powerful suction • Hard plates on shells • Examples • Purple sea stars • Sand fleas • Crabs • Barnacles

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