Sylvanus Griswold Morley, An Introduction to the Study of the Maya Hieroglyphs… (1915)
“ Having learned the number, length, and names of the several periods into which the Maya divided their year, and the sequence in which these followed one another, the next subject which claims attention is the positions of the several days in these periods. In order properly to present this important subject, it is first necessary to consider briefly how we count and number our own units of time, since through an understanding of these practices we shall better comprehend those of the ancient Maya.It is well known that our methods of counting time are inconsistent with each other. ”
