Calculate the solar zenith angle for given times and locations
zenith(sun, lon, lat)
list of solar time and declination computed by
vector of longitudes.
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
A vector of solar zenith angles (degrees) for the given locations and times.
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