10. YAX, first, or Yaax, green or blue, though, as the following month is Zac, white, I believe this should be Yaax.
"Incidents of Travel in Yucatan, Vol. I."
John L. Stephens
YAX, and as far as the first proposition is concerned, it is immaterial whether the form above given is called 0 or 20. Eight days have taken us out of the month Chen into the next month YAX, and to a day of that month which is not 1 YAX, but must be a day preceding 1 YAX, whether that is called 0 YAX or 20 YAX.
"Was the Beginning Day of the Maya Month Numbered Zero (or Twenty) or One?"
Charles P. Bowditch
According to this incontrovertible evidence we find that the sacred tree of life of the Mayas was designated by the word YAX, signifying first, original, new, etc.
"The Fundamental Principles of Old and New World Civilizations"
Zelia Nuttall