The day of Santa Maria della Neve [of the Snows] August the 2nd 1473. [Footnote: W. An. I. 1368. 1369. This date is on a drawing of a rocky landscape. See Chronique des Arts 1881 no. 23: Leonard de Vinci a-t-il ete au Righi le 5 aout 1473? letter by H. de Geymuller. The next following date in the MSS. is 1478 (see No. 663).
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.