GG101 Study Guide - Midterm Guide: Cool Air, Ionosphere, Spheroid
Document Summary
Latitude = angular distance north or south of the equator, measured from the center of. 1degree of latitude = 110km of linear distance. More precision: minutes of arc (represented by ) 1 minute of latitude= 1/60th of a degree. 1 minute of latitude ~ 1. 83km of linear distance. 1 second of arc is 1/60th of a minute. One second of arc is about 0. 031km, which is very roughly 30m. More precision: seconds of arc (represented by ) Longitude: is the angular distance east or west of a point on earths surface, measured from the center of the earth. Great circle: is any circle that splits the earth into exactly half, or coincides with the center of the earth (ex. Small circle: is any circle that does not coincide with the center of the earth (meridians) Mercator projection: most commonly used, is a cylindrical projection. Rhumb line: the line of constant direction or the mercator projection.
