Lec06 - Written HW#1 Uses UD Solar System model (see course...

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Written HW#1 • Uses UD Solar System model (see course web page) • Due class time this Wed. 9/21; hand in datasheet as printed hardcopy
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Jupiter plaque: outside Sharp Lab
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The Science of Astronomy: Key Themes • Many cultures developed Astronomy. – Why? • Ours rooted in Egypt/Greece and Renaissance. – Aristotle, Aristarchus; Tycho, Kepler, Galileo • Geocentric vs. Heliocentric Universe – Ptolemy vs. Copernicus, • Science vs. Dogma – What is science??
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Ancient Astronomy • Many cultures throughout the world practiced astronomy. • They made careful observations of the sky. • Over a period of time, they would notice the cyclic motions of: – Sun – Moon – planets – celestial sphere (stars)
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Stonehenge (completed ca. 1550 BC) If you stand in the middle: – the directions of sunrise & sunset on the solstices is marked. – the directions of extreme moon The Aubrey holes are believed to be an analog eclipse computer. This famous structure in England was used as an observatory.
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Mayans (f. A.D. 400 – 1200) • lived in central America • accurately predicted eclipses • Venus was very important • marked zenial passages • Mayan mathematics – base 20 system – invented the concept oF “zero” the Observatory at Chichén Itzá
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Anasazi (ca. A.D. 1000) • lived in “four corners” area of SW USA • built structures to mark solstices and equinoxes Pueblo Bonita at Chaco Canyon, NM Sun Dagger at Fajada Butte
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Plains Tribes of N. America • star maps and sighting circles were drawn on the ground to mark: – solstice rising points of Sun – helical rising points of stars Big Horn Medicine Wheel, WY
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– to keep time – to worship • As far as we can tell, none of these ancient cultures tried to build a physical model based on their observations. • Instead, they created myths to explain the motions
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This note was uploaded on 02/01/2012 for the course PHYS 133 taught by Professor Staff during the Fall '08 term at University of Delaware.

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Lec06 - Written HW#1 Uses UD Solar System model (see course...

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