Satellite Geolocation for Animal Tracking

Description Usage Arguments Details Value See Also

Estimate time of sunrise or sunset for a given location given the approximate solar time of twilight

1	twilightSolartime(solar, lon, lat, rise, zenith = 96)

`solar`	output of `solar` for approximate times of twilight.
`lon`	vector of longitudes.
`lat`	vector of latitudes.
`rise`	logical vector indicating whether to compute rise or set.
`zenith`	the solar zenith angle that defines twilight.

Solar declination and equation of time vary slowly over the day, and so the values of the Solar declination and equation of time at sunrise/sunset can be caclulated approximately if an approximate time of sunrise/sunset is known. The sun's hour angle and hence sunrise/sunset for the required zenith can then be calculated from these approximations.

Note this function returns the time of twilight in solar time.

a vector of twilight times in solar time (degrees)

twilight

KateGoodenough/RoL-SGAT documentation built on June 11, 2019, 1:29 p.m.