<P> Grouping the latitude and FAC altitude factors the expression most commonly found in the literature is: </P> <Dl> <Dd> g (φ, h) = g (φ) − 3.086 ⋅ 10 − 6 h (\ displaystyle g \ (\ phi, h \) = g \ (\ phi \) - 3.086 \ cdot 10 ^ (- 6) h) </Dd> </Dl> <Dd> g (φ, h) = g (φ) − 3.086 ⋅ 10 − 6 h (\ displaystyle g \ (\ phi, h \) = g \ (\ phi \) - 3.086 \ cdot 10 ^ (- 6) h) </Dd> <P> where g (φ, h) (\ displaystyle g \ (\ phi, h \)) = acceleration in m s at latitude φ (\ displaystyle \ \ phi) and altitude h in metres . </P>

How does gravity change the earth's surface