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27343609
Lesson 5: Navigation on Earth
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Covers: - Coordinate System - Longitude - Latitude - Determining Coordinates
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Dana Balin
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Resource summary
Lesson 5: Navigation on Earth
Coordinate System - assigns a pair of coordinates called longitude and latitude
Latitude - the angular distance in degrees North or South of the equator
Equator - the imaginary line that circles the Earth halfway between the North Pole and the South Pole
Prime Meridian - the imaginary line that runs through Greenwich, England, from the North Pole to the South Pole
Longitude - the angular distance in degrees East or West of the prime meridian
Parallels - the lines that connect points of equal latitude, called parallels because they never touch
Meridians - the lines that connect points of equal longitude, they all meet at the poles
Determining Latitude
Latitude north = the angle of Polaris above the horizon
Point stars (the 2 stars at the end of the bowl of the Big Dipper) point towards Polaris
Astrolabe - a tool used to measure the angle above the horizon of an object in the sky
Determining Longitude
(Local Time - Greenwich Local Time) * 15 = Longitude
Positive Longitude = West of the Prime Meridian
Negative Longitude = East of the Prime Meridian
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