1616 m) with Washington, D.C. (9.801 m/s²; 30 m), both of which are near 39° N. Measured values can be obtained from Physical and Mathematical Tables by T.M. Yarwood and F. Castle, Macmillan, revised edition 1970.

Mathematical models

If the terrain is at sea level, we can estimate, for the Geodetic Reference System 1980, , the acceleration at latitude :
:

This is the International Gravity Formula 1967, the 1967 Geodetic Reference System

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