Tzolkin is literally translated as “count of days” and it is a Mayan word.
Definition of tzolkin
: a period of 260 days constituting a complete cycle of all the permutations of 20-day names with the numbers 1 to 13 that constitutes the Maya sacred year.
It sprockets exactly with Earth’s 365-day solar year and the 64 Hexagram I Ching. The IChing and the 65 Harmonic Tzolkin also sprocket exactly and can be seen in my book “Time is DNA”