GeoLight (version 2.0.0)

zenith: Solar Zenith Angle

Description

Calculate the solar zenith angle for given times and locations

Usage

zenith(sun, lon, lat)

Arguments

sun

list of solar time and declination computed by solar.

lon

vector of longitudes.

lat

vector latitudes.

Value

A vector of solar zenith angles (degrees) for the given locations and times.

Details

zenith uses the solar time and declination calculated by solar to compute the solar zenith angle for given times and locations, using the same methods as www.esrl.noaa.gov/gmd/grad/solcalc/. This function does not adjust for atmospheric refraction see refracted.

See Also

solar

Examples

## Approx location of Sydney Harbour Bridge
lon <- 151.211
lat <- -33.852
## Solar zenith angle for noon on the first of May 2000
## at the Sydney Harbour Bridge
s <- solar(as.POSIXct("2000-05-01 12:00:00","EST"))
zenith(s,lon,lat)