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Geodesy /ˈɒdsi/,[1] an aa named geodetics, a branch o applied mathematics [2] an yird sciences, is the scientific discipline that deals wi the measurement an representation o the Yird, includin its gravitational field, in a three-dimensional time-varyin space. Geodesists an aa study geodynamical phenomena such as crustal motion, tides, an polar motion. For this thay design global an naitional control networks, uisin space an terrestrial techniques while relyin on datums an coordinate seestems.

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