The Da Vinci Notebooks at sacred-texts.com
On Tuesday I bought wine for morning [drinking]; on Friday the 4th day of September the same. 844
456:844 : This note enables us to fix the date of the Manuscript, in which it is to be found. In 1495 the 4th of September fell on a Friday; the contents of the Manuscript do not permit us to assign it to a much earlier or later date (Compare No. 1522, and Note).