gravity {marelac}

Gravity on Earth

Description

Computes the gravity, based on latitude.

Usage

gravity(lat = 0, method = c("Moritz", "UNESCO"))

Arguments

lat

latitude (-90 - +90).

method

When "UNESCO", uses the UNESCO (1983) polynomial, else according to Moritz, 2000

Value

Gravity, in \rm m\,sec^{-2}.

Author(s)

Karline Soetaert <[e-mail]>

References

The UNESCO polynomial:

Fofonoff NP and Millard RC Jr, 1983. Algorithms for computation of fundamental properties of seawater. UNESCO technical papers in marine science, 44, 53 pp.
http://unesdoc.unesco.org/images/0005/000598/059832EB.pdf

Moritz H, 2000. Geodetic reference system 1980. Journal of Geodesy 74, 128-133.

See Also

coriolis, viscosity, diffcoeff, ssd2rad, vertmean

Examples

gravity(lat = 30)