?????????????Evidence for Earth's shape (OBLATE SPHEROID) Gravitational measurements: stronger at poles (closer to center) weaker at equator (further from center) Altitude of polaris does not match latitude. Moving 1o north or south on the earth’s surface does not always result in a change of exactly 1o in the altitude of Polaris. If the was perfectly round this slight difference would not occur. ?????????Determination of circumference Eratothenes experiment Get of noon sun at 2 locations on the same meridian (N-S line) Find difference between 2 angles Get distance between 2 locations Divide difference into 360E Multiply result by the distance = Circumf. 360 Circumference = ------------------------- X Distance (Angle 2) - (Angle 1) ??????Diameter of the Earth D = 2r b) D = (2) (6.37 X 103) c) D = 12.74 X 10³ or 1.274 X 104 Hydrosphere
?????????????Evidence for Earth's shape (OBLATE SPHEROID) Gravitational measurements: stronger at poles (closer to center) weaker at equator (further from center) Altitude of polaris does not match latitude. Moving 1o north or south on the earth’s surface does not always result in a change of exactly 1o in the altitude of Polaris. If the was perfectly round this slight difference would not occur. ?????????Determination of circumference Eratothenes experiment Get of noon sun at 2 locations on the same meridian (N-S line) Find difference between 2 angles Get distance between 2 locations Divide difference into 360E Multiply result by the distance = Circumf. 360 Circumference = ------------------------- X Distance (Angle 2) - (Angle 1) ??????Diameter of the Earth D = 2r b) D = (2) (6.37 X 103) c) D = 12.74 X 10³ or 1.274 X 104 Hydrosphere
MIDTERM%20TEST%20NOTES%20REVIEW%20%281%29.docx