calculations for a totally distinct purpose about the end of the last century, and found that in 1476 there was no eclipse of the sun visible in Mexico, but that there was a great one on the 13th Feb., 1477, and another on the 28th May, 1481.
Supposing that Gama made no mistake in his calculations, the idea at once suggests itself, that the person who compiled or copied the Le Tellier Codex, some few years after the Spanish Conquest of Mexico, inserted under the date of 1476 (long before the time of the Spaniards) an eclipse which could not have been recorded there had the document been a genuine Aztec Calendar; as, though visible in Europe, it was not visible in Mexico. The supposition of the compiler having merely inserted this date from a European table of eclipses is strengthened by the fact that the great eclipse of 1477, which was visible in Mexico, but not in Europe, is not to be found there. These two facts tend to prove that the Codex, though undoubtedly in great part a copy or compilation from genuine native materials, has been deliberately sophisticated with a view of giving it a greater appearance of historical accuracy, by some person who was not quite clever enough to do his work properly. It may, however, be urged as a proof that the mistake is merely the result of carelessness, that we find in the MS. no notice of the eclipse of 25th May, 1481, which was visible both in Mexico and in Europe, and so ought to have been in the record. This supposition would be consistent with the Codex being really a document in which the part relating to the events before the Spanish Conquest in 1521 is of genuine ancient and native origin, though the whole is compiled in a very grossly careless manner. It would be very desirable to verify the years of all the four eclipses with reference to their being visible in Mexico, as this might probably clear up the difficulty.