![]() “ Latitude and Longitude of the Earth” (author unknown) licensed under the Creative Commons CC0 1.0 Universal Public Domain Dedication. At the equator, the sun is directly overhead at noon on the two equinoxes, which occur in March and September. The line is the longest when one travels along in an east-west direction. The systems of longitude and latitude are formed from these lines, allowing users to locate themselves anywhere on the planet. The two primary lines are the equator and the prime meridian. Geographers and cartographers organize locations on the earth using a series of imaginary lines that encircle the globe. Lines of latitude and longitude allow any absolute location on the planet to have an identifiable address of degrees north or south and east or west, enabling geographers to locate, measure, and study spatial activity accurately. The earth has 360 degrees and is measured using a grid pattern called the graticule. 1.4 Mapping Technology Geographic Grid Systems ![]()
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