with a solar position and solar radiation time-series calculator; by Greg Pelletier DOE information(页面存档备份,存于互联网档案馆) about the ASTM standard solar spectrum
and Anatoly Tsvetkov. From Dimming to Brightening: Decadal Changes in Solar Radiation at Earth's Surface. Science. 2005, 308 (5723): 847–50. PMID 15879214