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THIS PRESENTAION HAS BEEN RATED BY THE CLASSIFICATION AND RATING ADMINISTRATION TG-13 TEACHERS’ GUIDANCE STRONGLY ADVISED Some Material May Be Unintelligible For Students Under 13. Intense Frames of Scientific Instruction, Analysis, Comparing and Contrasting, Description, and for Some Vocabulary. © 1852 All Rights Reserved VOID WHERE PROHIBITED BY LAW
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The authorized reproduction or distribution of this copyrighted work is highly encouraged. Lethargic obtuseness is insubordinate and is discouraged by PBIS, as it may result in little or no monetary gain after secondary education or a fine of $250,000. © 1852 All Rights Reserved VOID WHERE PROHIBITED BY LAW PBIS ANTI-VACUITY
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ASTRONOMY The Moon (A.K.A. Luna)
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OBJECTIVES By the end of this presentation, students will be able to Explain the causes of tides. Compare the similarities and contrast the differences between Neap Tides and Spring Tides.
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TIDES The moon exerts a gravitational force on both sides of the earth. Because one side is closer than the other, the pull on the side closer to the moon is stronger than the pull on the side that is farthest from the moon.
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The net effect is to elongate the shape of the earth into what is called a prolate spheroid. As the earth spins, each part experiences this elongation twice each day; TIDES once while the moon is approaching its zenith, once about 12 hours later.
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Since the oceans are not as rigid as the solid earth, they are affected more be this gravitational differential. Thus, people living near the shores will experience the tides rise an fall twice each day: TIDES High Tide Low Tide High Tide Low Tide
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SUN This diagram shows the position of the moon at four locations in its orbit around the earth: New Moon, 1 st Quarter, Full Moon and 3 rd Quarter. TIDES
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SUN When the earth, sun and moon are lined up, tides due to the sun coincide with tides due to the moon. TIDES
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SUN This produces higher than average high tides, and lower than average low tides. TIDES
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SUN These are called Spring Tides They occur during the new moon phase and the full moon phase, when the sun, earth and moon are aligned. TIDES
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SUN When the earth, sun and moon are at right angles to each other, tides due to the sun partly cancel the tides due to the moon. TIDES
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SUN This produces lower than average high tides, and higher than average low tides. TIDES
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SUN These are called Neap Tides They occur during the 1st quarter phase and the 3rd quarter phase. TIDES
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SUN This diagram shows the position of the moon at four locations in its orbit around the earth: New Moon, 1 st Quarter, Full Moon and 3 rd Quarter. TIDES
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SUN This diagram shows the position of the moon at four locations in its orbit around the earth: New Moon, 1 st Quarter, Full Moon and 3 rd Quarter. TIDES
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SUN This diagram shows the position of the moon at four locations in its orbit around the earth: New Moon, 1 st Quarter, Full Moon and 3 rd Quarter. TIDES
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SUN This diagram shows the position of the moon at four locations in its orbit around the earth: New Moon, 1 st Quarter, Full Moon and 3 rd Quarter. TIDES
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ASTRONOMY The Moon (A.K.A. Luna)
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