"The Yucatecs differed materially from the Mexicans with regard to the time of the solar year, when their year began. Don J. P. Perez informs us, that the first day of the Yucatan year corresponded with the sixteenth day of July; and that this was the day of the transit of the sun by the zenith of a place which he does not mention. But he adds that, for want of proper instruments, the Indians had made a mistake of forty-eight hours. In point of fact, it is in the latitude of about twenty-one degrees and a half that the transit of the sun by the zenith occurs on the 16th of July; and Yucatan lies between the latitudes of about eighteen degrees and a half and twenty-one degrees and a half. To commence the year on the day of the transit of the sun by the zenith, is attended with the great inconvenience, that this commencement must vary from place to place, according to their respective latitudes. As Don J. Pio Perez counts every year as having 365 days, and without regard to the omitted bissextile days, it is clear that the day in the Yucatan calendar, on which the transit of the sun by the zenith of any one place occurs, would vary twenty days, or a whole Indian month, in the course of eighty years. This would create such confusion that, if it be a well ascertained fact, that the Yucatan year began on the zenith day, this renders it highly probable that the calendar was, like that of the Mexicans, corrected by an intercalation of thirteen days at the end of the cycle. * * * * * "The names of the eighteen months of the Yucatecos, together with such interpretations as Don Pio Perez has given us, their order and their correspondence with our year, new style, appear in the following table: TABLE OF YUCATESE MONTHS.