gravity: gravity
In jonasbhend/pressurehelper: Convert historical air pressure records

Compute gravity at latitude phi

1	gravity(phi, elevation = 0)

`phi`	latitude (in degrees)
`elevation`	elevation (in m)

http://library.wmo.int/pmb_ged/wmo_8_en-2012.pdf

## gravity at equator
gravity(0)
## gravity at pole
gravity(90)

jonasbhend/pressurehelper documentation built on May 19, 2019, 7:27 p.m.

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