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Learn about latitude and longitude, the imaginary lines used to locate positions on Earth. Discover how to use coordinates to precisely identify locations and understand the concept of time zones.
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Latitude and Longitude Section 2.1
Latitude • Cartography – the science of mapmaking • Equator – imaginary line that circles Earth horizontally halfway between the poles; separates Earth into two halves • Equator = 0 degrees latitude • Latitude – lines on a map that run parallel to the equator; measured from 0 degrees to 90 degrees
Latitude • 1 degree of latitude = 111 km • Circumference of Earth = 40,000 km • Minutes (‘) = 1.85 km • Seconds (“)
Longitude • Longitude – used by cartographers to locate positions east and west ; also divided into degrees, minutes, and seconds; 0 degrees to 180 degrees • Prime meridian – 0 degrees longitude • Why does the prime meridian run through Greenwich, England?
Longitude • Longitude lines are not parallel; they are semicircles • Degrees of longitude can vary in their distances from 0 km to 111 km • Lines of longitude meet at the poles
Using Coordinates • To locate a position on Earth precisely, scientists must use longitude and latitude lines • Earth is divided into time zones • Each time zone is roughly 15 degrees wide; What time zone do we live in? • Describe the International Date Line.