The Sun C. G. Abbot

"Within the last fifteen years we have seen the publication of Rowland"s great table of solar spectrum wave lengths, the establishment of the Yerkes, Kodaikanal, Mount Wilson and other observatories largely devoted to solar researches, the photography of the spectrum of the corona and of the chromosphere at total solar eclipses..." Воспроизведено в оригинальной авторской орфографии издания 1911 года (издательство "D. Appleton and Company"). Это и многое другое вы найдете в книге The Sun (C. G. Abbot)