The year being composed of 28 weeks and one additional day or number, the course of the years, on account of that excess, followed the arithmetical progression of the thirteen weekly numbers; so that if a year commenced with the number 1, the next would commence with number 2, and so on to the close of the 13 years, which formed an indiction, or week of years, as will be explained hereafter.
"Incidents of Travel in Yucatan, Vol. I."
John L. Stephens
It has also been stated that the year consisted of 28 weeks of 13 days each, and of one additional day; so that, if the year commenced with the number one of the week, it ended with the same number, and the ensuing year began with number two; and so on through the thirteen numbers of the week, thus forming, with the four initial days, the week of years, or indiction, of which we shall speak hereafter.
"Incidents of Travel in Yucatan, Vol. I."
John L. Stephens
Of the indiction and Cycle of 52 Years, or Katun.
"Incidents of Travel in Yucatan, Vol. I."
John L. Stephens