Calculate solar time, the equation of time and solar declination
Usage
solar(tm)
Arguments
tm
a vector of POSIXct times.
Value
A list containing the following vectors.
solarTime
the solar time (degrees)
eqnTime
the equation of time (minutes of time)
sinSolarDec
sine of the solar declination
cosSolarDec
cosine of the solar declination
Details
The solar time, the equation of time and the sine and cosine of
the solar declination are calculted for the times specified by
tm using the same methods as
www.esrl.noaa.gov/gmd/grad/solcalc/.