Calculate the solar zenith angle for given times and locations
Arguments
- sun
list of solar time and declination computed by
solar
.- lon
vector of longitudes.
- lat
vector latitudes.
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
https://gml.noaa.gov/grad/solcalc/. This function does not adjust for atmospheric
refraction see refracted
.
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)
#> [1] 133.9373