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

by Agnes M. Clerke

[953] Astroph. Jour., vol. viii., pp. 199, 265.

[954] Airy, Observatory, vol. iii., p. 420.

[955] Phil. Trans., vol. cxliii., p. 397; Proc. Roy. Soc., vol. vi., p. 321.

[956] Comptes Rendus, t. lxi., p. 1023.

[957] Professor Darwin calculated that the heat generated by tidal friction in the course of lengthening the earth's period of rotation from 23 to 24 hours, equalled 23 million times the amount of its present annual loss by cooling. Nature, vol. xxxiv., p. 422.

[958] Sämmtl. Werke (ed. 1839), Th. vi., pp. 5-12. See also C. J. Monro's useful indications in Nature, vol. vii., p. 241.

[959] Dynamik des Himmels, p. 40.

[960] Gould's Astr. Jour., vol. iii., p. 138.

[961] Wash. Obs. for 1875, vol. xxii., App. ii.

[962] Comptes Rendus, t. cxiii., p. 669; Annuaire, Paris, 1892.