Phases of Venus in 1610

Gingerich Owen , “The Galileo affair”. Scientific American, ccxlvii (1982), August issue, 133–43, pp. 136–7.

Opere di Galileo Galilei , ed. nazionale, ed. by Favaro A. (Florence, 1890–1910 and later printings), x, 494. Note the new translation provided by Stillman Drake in the preceding article.

Galileo to de' Medici Giuliano , 11 December 1610, ibid., x, 483.

Galileo to de' Medici Giuliano , 1 January 1611, ibid., xi, 11–12.

Galileo to Castelli Benedetto , 30 December 1610, ibid., x, 502–504; translated by Stillman Drake at the end of the preceding article.