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Unformatted text preview: 1/12/10 Earth is a sphere or has a spheroidal shape. It is a little "squished" at the poles or has what is called a geoidal bulge at the equator. Equatorial diameter: 12,756 km = 7926 mi (24,902 mi circumference) Polar diameter: 12,714 km = 7900 mi (24,860 mi cir.) To Locate Places on the surface we use a grid system. Several types have been developed and are in use. Most common or well known is the latitude and longitude grid system. Latitude : parallel lines that run East-West , and are measured North- South , starting at 0 (the Equator) , and ending at the 90 (N & S Pole) Longitude : non-parallel lines that run North-South , and are measured East-West starting at 0 (the Prime Meridian) , and ending at 180 (the I nternational Date Line) ** degree is one part of a circle, with 360 parts or degrees in a complete circle ** a degree is sub-divided into 60 equal parts or minutes ** a minute is sub-divided into 60 equal parts or seconds EX: 30 35' 15" N 87 55' 30" W Latitude must have a N or S after it for north(N) or south(S) Parallels of Latitude are about 111 km (69 mi) apart Longitude is similar, with an E or W for east(E) or west(W) Meridians of Longitude are 111 km (69 mi) apart only at the equator . Parallels of latitude are about 111km (69 mi) apart no matter which two you pick. Meridians of Longitude are 111km (69 mi) apart only at the equator. Prime Meridian- 0 degrees longitude Intl Date Line (180 th Meridian) North Pole 90 degrees north South Pole 90 degrees South Arctic: 66.5 degrees N Subartic: 55 degrees N to 66.5 degrees N Equator: 23.5 degrees North Tropic of Capricorn- 23.5 degrees South Latitude and Longitude is connected with the Earths tilt: Halfway between the poles is the equator, which the solar altitude is 90 degrees on equinox days...
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This note was uploaded on 01/17/2011 for the course GEOG 1113 taught by Professor Hodler during the Spring '08 term at University of Georgia Athens.
- Spring '08