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

by Agnes M. Clerke

[639] Harzer, Astr. Nach., No. 3,026; Stratonoff, Ibid., No. 3,344.

[640] Publ. Astr. Pacific Soc., vol. ii., p. 193.

[641] Proc. Roy. Society, vols. xvii., p. 415; xviii., p. 120.

[642] Comptes Rendus, t. cxii., p. 1421; t. cxiii., p. 310.

[643] At the sun's distance, one second of arc represents about 450 miles.

[644] Amer. Jour. of Sc., vol. ii., p. 468, 1871.

[645] Month. Not., vol. xxxii., p. 51.

[646] Nature, vol. xxiii., p. 281.

[647] Comptes Rendus, t. lxxxvii., p. 532.

[648] Ibid., t. xcvi., p. 359.