Of these the first-fruit was his Clave Historial, a work of the same class as the French Art de verifier les dates, and preceding it by several years.
This is the epoch assumed by the authors of L'Art de verifier les dates.
All The Tables Of This Kind Previously Published, Which Extend Beyond The Year 1900 Of The Christian Era, Are Erroneous, Not Excepting The Celebrated French Work, L'Art De Verifier Les Dates, So Justly Regarded As The Greatest Authority In Chronological Matters.
An instance is given, in L' Art de verifier les dates, of a date in which the year is reckoned from the 18th of March; but it is probable that this refers to the astronomical year, and that the 18th of March was taken for the day of the vernal equinox.
