GEOG 2110L Lecture Notes - International Date Line, Antarctic Circle
17 Mar 2014
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Document Summary
Earth is a sphere or has a spheroidal shape. It actually bulges at the equator or more accurately has a geoidal bulge at the equator. 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. start at. 0 (equator), end at 90 (poles) cannot go past 90 latitude. Longitude: non-parallel lines that run north-south and are measured east-west, start at 0 (prime meridian) and end at 180 (international date line. ** degree: 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.
