Dictionary:International Gravity Formula

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Theoretical gravity (as of 1987) is

978 032.68 (1+0.001 931 851 386 39sin2)/


(1–0.006 694 379 990 13sin2)1/2 mGal,


where is the latitude. Older versions of the IGF are:

1930:978 049.0 (1+0.005 288 4sin2


–0.000 005 9sin22) mGal,


1967:978 031.8 (1+0.005 302 4sin2


–0.000 005 8sin22) mGal.


See latitude correction.