Local acceleration of gravity.

(a) The acceleration of Earth's gravity, a g , varies depending on the test location. Determine a g at your location by entering latitude, longitude, and elevation data into the U.S. National Oceanographic and Atmospheric Administration's surface gravity prediction website at https://geodesy.noaa.gov/cgi-bin/grav_pdx.prl. (b) If the website specified in paragraph (a) of this section is unavailable, or the test location is outside of the continental United States, you may calculate a g for your latitude as follows: Where: u = Degrees north or south latitude. Example: u = 45° a g = 9.7803267715 · (1 + 5.2790414 · 10 −3 · sin 2 (45) + 2.32718 · 10 −5 · sin 4 (45) + 1.262 · 10 −7 · sin 6 (45) + 7 · 10 −10 · sin 8 (45) a g = 9.8061992026 m/s 2 [79 FR 23784, Apr. 28, 2014, as amended at 88 FR 4680, Jan. 24, 2023]