Corrections and additions for ``The moon-test in Newton's principia: Accuracy of inverse-square law of universal gravitation'' (Q1913677)

[This concerns the article in Arch. Hist. Exact. Sci. 44, No. 2, 147-190 (1992; Zbl 0763.01008).] In Huygens' Horologium Oscillatorium (1673) there is a statement that the distance of fall is 15 feet 1 inch (Paris) without giving more digits. The author discusses why Newton did not content with this accuracy. One conceivable reason is that Newton wanted to defend himself and to strengthen his standpoint against the criticism by Leibniz, who maintained that universal gravitation is not explainable or is a scholastic occult quality. The author comes to the conclusion that 15 feet 1 inch, the final value Huygens gave as the distance of fall, is reasonable, but that Newton's adopted value in the third edition of the Principia is given to an unreasonable number of significant figures.