Editing Maya calendar (section)

==Short count==
During the late Classic period the Maya began to use an abbreviated short count instead of the Long Count. An example of this can be found on altar 14 at Tikal.<ref>Coe, William R. 'TIKAL a handbook of the ancient Maya Ruins' The University Museum of the University of Pennsylvania, Philadelphia, Pa. 1967 p. 114</ref> In the kingdoms of Postclassic Yucatán, the Short Count was used instead of the Long Count. The cyclical Short Count is a count of 13&nbsp;kʼatuns (or 260&nbsp;tuns), in which each kʼatun was named after its concluding day, Ahau ('Lord'). 1&nbsp;Imix was selected as the recurrent 'first day' of the cycle, corresponding to 1 [[Cipactli]] in the Aztec day count. The cycle was counted from katun 11&nbsp;Ahau to katun 13&nbsp;Ahau. Since a katun is {{math|20 × 360 {{=}} 7200}} days long, and the remainder of 7200 divided by 13 is 11 ({{math|7200 {{=}} 553×13 + 11}}), the day number of the concluding day of each successive katun is 9 greater than before (wrapping around at 13, since only 13 day numbers are used). That is, starting with the katun that begins with 1{{nbsp}}Imix, the sequence of concluding day numbers is 11, 9, 7, 5, 3, 1, 12, 10, 8, 6, 4, 2, 13, 11, ..., all named Ahau. The concluding day 13&nbsp;Ahau was followed by the re-entering first day 1&nbsp;Imix. This is the system as found in the colonial Books of [[Chilam Balam]]. In characteristic Mesoamerican fashion, these books project the cycle onto the landscape, with 13 ''Ahauob'' 'Lordships' dividing the land of Yucatán into 13 'kingdoms'.<ref>Roys 1967: 132, 184–185</ref>