GEO 155 - Latitude and longitude; radiation

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Latitude and longitude; Radiation 23:24 Latitude and Longitude Earth as a Geoid Geodesy The science that determines Earth’s shape and size by surveys and mathematical  calculations. Newton theorized that earth is an oblate ellipsoid, with the oblateness occurring at the  poles, because of the centrifugal force pulled around the equator (equatorial bulge) Geoid Describes earth’s shape The shape of earth is earth-shaped Eratosthenes Greek astronomer and the librarian of Alexandria Calculated Earth’s circumference to a high level of accuracy, in 247 BC Shadow cast by obelisk to well of Syene formed an arc of Earth’s circumference.  Was  equal to 5000 stadia. Multipled that by 50 and was off by only 2,000 from actual  measurement Ptolemy Divided circle into 360 degrees Latitude An angular distance north or south of the equator Line connecting all points along the same latitudinal angle is a parallel.   Latitude is the name of the angle (49 degrees North) and parallel names the line (49 th  parallel), and both indicate distances North of the equator

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