I agree that "theoretical clear-sky radiation" (with English pedant hyphenation, required when an adjective modifies a second one instead of the noun, although that is getting lost over time) is the proper term.
In addition to the reflections and cloud edge lensing (both of which I've seen), there are the issues that the theory is an approximation and the measurements have errors. Even still, I sometimes see measured over theory, but it's close and it's the same shape. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/rmi351eoot0.fsf%40s1.lexort.com.
