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
The Calendar of Nature "The Months". The 1821 edition contained a preface which declared, "The good-nature with which this Calendar was received on its appearance in 1819 ... has induced its republication in a separate form, with considerable additions". The 1821 edition also included the final two stanzas of John Keats's poem "To Autumn" with the claim that "A living poet has happily personified autumn in some of the pleasantest shapes under which her servants appear". The work quotes Percy Bysshe Shelley and discusses the works of Edmund Spenser. The calendar also refers to Shelley regarding autumn when it states: "The poet still takes