Dictionary:International Gravity Standarization Net (IGSN71)

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{{#category_index:I|International Gravity Standarization Net (IGSN71)}} International Gravity Standarization Net (IGSN71): The accepted reference frame for absolute gravity measurements. Supersedes the Potsdam System that was defined by pendulum measurements in 1906. See Woollard (1979).

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