Calculating Solar Radiation and Related Variables Based on Location, Time and Topographical Conditions
Solar Altitude Angle
Apparent Solar Time
Solar Azimuth Angle
Day Length
Day of year
Declination Angle
Solar Diffuse Radiation on a Surface
Atmospheric Diffusion Factor
Solar Direct Beam Radiation on Surface
Equation of time
Solar Extraterrestrial Radiation
Normal Extraterrestrial Solar Radiation
Solar Hour Angle
Solar Incidence Angle
Local Standard Time
Open Sky Solar Radiation
Calculating Solar Variables
Solar Constant
Sunrise Time
Sunset Time
Atmospheric Transmittance
For surface energy models and estimation of solar positions and components with varying topography, time and locations. The functions calculate solar top-of-atmosphere, open, diffuse and direct components, atmospheric transmittance and diffuse factors, day length, sunrise and sunset, solar azimuth, zenith, altitude, incidence, and hour angles, earth declination angle, equation of time, and solar constant. Details about the methods and equations are explained in Seyednasrollah, Bijan, Mukesh Kumar, and Timothy E. Link. 'On the role of vegetation density on net snow cover radiation at the forest floor.' Journal of Geophysical Research: Atmospheres 118.15 (2013): 8359-8374, <doi:10.1002/jgrd.50575>.