Earth's gravity


Precise values of Earth's gravity, denoted g, vary depending on the location on the Earth's surface. The ''standard acceleration due to gravity'' at the Earth's surface is, by definition, 9.80665 m/s² (32.1740 ft/s²). This quantity is known variously as g<sub>n</sub>, g<sub>e</sub> (though this sometimes means the normal equatorial value on Earth, 9.78033 m/s²), g<sub>0</sub>, gee, or simply g (which is also used for the variable local value). The variation in gravitational strength per unit distance is measured in inverse seconds squared or in eotvoses, a cgs unit of gravitational gradient.