I have carefully viewed the articles posted by Mr Christopher. They are very interesting, well laid out and equally well developed topics. I am interested in their content, and for this I thank the author for making them available in this forum. For a few years now, I have been interested in sky transparency and observing sunrise and sunset light in order to detect the ‘optical depth’ parameter. I have a small archive of data from about 300 observations. I will try to identify the possible existence of a correlation between the theory Christopher applies and the one I use for my observations. I hope this will provide good guidance for further experiments and studies. Thank you Christopher.
British Astronomical Association
Supporting amateur astronomers since 1890