"Month" is called in the Yucateco language "U," which means also "the moon;" and this corroborates the presumption that the Indians went on from the computation of lunations to determine the course of the sun, calling the months "moons." But in some manuscripts, the name of _Uinal_ in the singular and _Uinalob_ in the plural is given to the eighteen months which compose the year; applying this comprehensive term to the series, and to each one of the particular names assigned to the twenty days that composed the month. The day was called _Kin_, "the sun;" and the particular names by which the 20 days composing the month were designated are stated in the following table, in which they are divided into sets of five, for the better understanding of the subsequent explanations. 1st. 2d. 3d. 4th. Kan. Muluc. Gix (Hix) Ca-uac. Chicchan. Oc. Men. Ajau (Ahau). Quimi (Cimi). Chuen. Quib (Cib). Ymix. Manik. Eb. Caban. Yk. Lamat. Been. Edznab. Akbal. As those names corresponded in number with the days of the month, it followed that, the name of the first day of the year being known, the names of the first days of all the successive months were equally known; and they were distinguished from each other only by adding the number of the week to which they respectively belonged. But the week consisting of thirteen days, the month necessarily consisted of a week and seven days; so that if the month began with the first number of a week, it ended with the seventh number of the week ensuing. [In order to know the number of the week corresponding with the first day of each month respectively, it is necessary only to know the number of the week with which the year begins, and to add successively seven, but subtracting thirteen whenever the sum of this addition exceeds thirteen, which gives the following series for the first days of the eighteen months: 1, 8, 2 (15-13), 9, 3 (16-13), 10, 4, 11, 5, 12, 6, 13, 7, 1, 8, 2, 9, 3, supposing the first day of the year to be the first day of the week, and generally taking for the first number of the series the number of the week by which the year begins.] 4 deg.. _The Year._