Note 10 — THE LEARDO MAP OF THE WORLD 1452 OR 1453
Reading edition
The following is a comparison of the times of the new moon on certain dates as indicated by Leardo with the actual times as determined for the meridian of Venice from Th. von Oppolzer,
Canon der Finsternisse
(constituting
Denkschr. Kaiserl. Akad. der Wiss. in Wien, Math.-naturw. Classe
, Vol. 52, 1887).
Leardo’s Times Actual Times
1453 Dec. 1 ? hrs. 203? pts. Nov. 30 2.40 P. M.
1455 Apr. 16 21 hrs. ? Apr. 17 12.22 A. M.
1456 Apr. 6 7 hrs. 229 pts. Apr. 5 4.25 A. M.
1461 Jan. 11 21 hrs. ? Jan. 11 8.44 P. M.
1468 Feb. 23 14 hrs. 747 pts. Feb. 23 10.15 P. M.
The discrepancies are too great and too variable to enable us to come to any very definite conclusions as to the place or manner of origin of Leardo’s figures.