A Popular History of Astronomy During the Nineteenth Century / Fourth Edition

by Agnes M. Clerke

[1051] Month. Not., vol. xl., p. 433.

[1052] Sitzungsberichte, Berlin, 1895, ii., p. 15.

[1053] The anomalous shadow-effects recorded by Webb (Cel. Objects, p. 170, 4th ed.) are obviously of atmospheric and optical origin.

[1054] Engelmann, Ueber die Helligkeitsverhältnisse der Jupiterstrabanten, p. 59.

[1055] Month. Not., vol. xxviii., p. 11.

[1056] Observatory, vol. vii., p. 175.

[1057] Month. Not., vol. xlviii., p. 43.

[1058] Publ. Astr. Pac. Soc., vol. ii., p. 296.

[1059] Pickering failed to obtain any photometric evidence of their variability. Harvard Annals, vol. xi., p. 245.

[1060] Astr. and Astroph., vol. xii., pp. 194, 481.