Summary

Portrait of Ernst Förstemann Ernst Förstemann Commentary on the Maya Manuscript in the Royal Public Library of Dresden… (1906)

The principal series contains all the even and the secondary series all the uneven days. Can the starting-point of the revolution of Mars have been determined according to different principles? Is it possible that in one case the beginning of the planet's retrogression was adopted as the starting-point, and in the other case the date on which the planet, after completing its retrograde course, again reached the degree of right ascension at which it had begun its retrogression? This is a difficult matter to decide, since the period of the retrogression of Mars fluctuates between 62 and 81 days.
Source: Wikisource

Portrait of Ernst Förstemann Ernst Förstemann Commentary on the Maya Manuscript in the Royal Public Library of Dresden… (1906)

Now the Mayas had determined the lunar revolution so exactly that they perceived the incompatibility of the period of 11,960 days with a multiple of lunar revolutions. They found that 405 lunar revolutions amounted approximately to 11,958 days, which is, in fact, the largest number on the second half of page 58. In order not to drop the significant 11,960 altogether, they made use of a very shrewd artifice. They took as the starting-point the day XII Lamat, corresponding to the number 11,960, and set down XI Manik before it and XIII Muluc after it.
Source: Wikisource

Portrait of Ernst Förstemann Ernst Förstemann Commentary on the Maya Manuscript in the Royal Public Library of Dresden… (1906)

All this points to the day 18 Kayab, of one of the Kan years, if, as I stated above, we base our computation on the middle series of dates.
Now we have yet to examine the eight signs of the lower group, which we will do in the following order:—
Regarding the beginnings of these groups, I will venture a bold surmise, which will, I hope, be improved upon by some one else. It concerns the first sign of four of these five groups, which seem to me to refer to the end of the Venus year, as those above refer to the beginning.
Source: Wikisource

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