02_Aug30[1] notes - Solar Eclipses Eclipses Total Solar...

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Scales of Time
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II. PREHISTORIC ASTRONOMY Astronomy is the oldest profession , universal to all cultures. • Motivation is prediction, dating, navigation, harvest, plantings, births, deaths • Astrology (an example of a pseudoscience): prediction and dating lead to confusion of cause and effect • Ancient structures built with astronomically significant orientations
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Stonehenge
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Picture of Ancient Egyptian Cosmology
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Mayan Site of Edzna: 1 st Century
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Close-up of New Year Column
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Casa Grande Arizona c. 1350
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• Eclipses – sun and moon very important in daily life of ancients -- Solar and lunar eclipses, partial and total, penumbra, umbra --Ancients could predict by observing cycles of repetition(Saros cycle = 18 yr 11d). Note this does not imply an understanding of the cause of the eclipse • Let ` s look at causes of cycles and eclipses, and understand geometry of eclipses
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Phases of the Moon
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Lunar Eclipses
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