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A Brief History of Geodesy [720p]

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Published on Feb 24, 2012

Geodesy is a field of study that deals with the measurement and representation of the Earth, and it all started when a clever human named Eratosthenes discovered that you could measure the circumference of the Earth by looking down a well. Over time, the field of geodesy has expanded and evolved dramatically, and NASA uses technology like radio telescopes, ground surveys, and satellites to contribute.

credit: NASA/Goddard Space Flight Center

source: http://svs.gsfc.nasa.gov/goto?10910

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