Registers of days or other contrivances for reckoning days, months, years, etc., such as a table showing the division of a given year into its months, weeks, days, years, or other divisions of time. A calendar may include important astronomical data, ecclesiastical or other festivals, and other events belonging to specific days. For calendric systems of dates, see children under "<dating systems by specific type>.
Source: Art & Architecture Thesaurus
http://vocab.getty.edu/page/aat/300026741
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