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Updated: October 18, 2026
D. Cassini, however, first put forward about 1671 the hypothesis alluded to in the text. See Delambre, Hist. de l'Astr. Berl. Ges. Cf. Grant, Astr. Nach., No. 1838. Ency., art. Am. Phil. Trans., vol. xxxviii., p. 134. It. Am. Phil. R. A. S., vol. xxi., pp. 54, 56. Santini had made a similar observation at Padua in 1842. Grant, Hist.