ASTM-G197 › Complete Document History
Standard Table for Reference Solar Spectral Distributions: Direct and Diffuse on 20° Tilted and Vertical Surfaces

Complete Current Edition:
   2014 R21 EDITION - REAPPROVED IN 2021 - July 26, 2021

Obsolete Revision Information:
   2014 EDITION - Reference Solar Spectral Distributions: Direct and Diffuse on 20 degrees Tilted and Vertical Surfaces - Dec. 15, 2014
   2008 R12 EDITION - REAPPROVED IN 2012 - Dec. 1, 2012
   2008 EDITION - Reference Solar Spectral Distributions: Direct and Diffuse o - June 1, 2008