nemfrog:Fig. 53. The corona of January 1st, 1889.” The story of the Sun. 1906.
nemfrog: Fig. 53. The corona of January 1st, 1889.” The story of the Sun. 1906. -- source link
nemfrog: Fig. 53. The corona of January 1st, 1889.” The story of the Sun. 1906. -- source link