Mesoamerican Long Count calendar the use of zero as a place-holder and presents one of the earliest uses of the zero concept in history. On Maya monuments, the Long Count syntax is more complex. The date sequence is given once, at the beginning of the inscription and opens with the so-called ISIG (Introductory Series Initial Glyph) which reads "tzik-a(h) hab’ [patron of Haab' month]" ("revered was the year-count with the patron [of the month]"). Next come the 5 digits of the Long Count, followed by the Calendar Round (tzolk'in and Haab') and supplementary series. The supplementary series is optional and contains lunar data, for
Armenian calendar Armenian calendar The Armenian calendar is the calendar traditionally used in Armenia. The older Armenian calendar was based on an invariant year length of 365 days. As a result, the correspondence between it and both the solar year and the Julian calendar slowly drifted over time, shifting across a year of the Julian calendar once in 1,461 calendar years (see Sothic cycle). Thus, the Armenian year 1461 (Gregorian 2010/2011) completed the first full cycle. Armenian year 1 began on 11 July 552 of the Julian calendar, and Armenian year 1462 began on 11 July 2012 of the Julian calendar which