calendar

A Dictionary of Weights, Measures, and Units | 2002| | Copyright

calendar time A scheme for grouping, labelling, and thereby distinguishing the individual days. The Moon and the Sun provide conspicuous natural groupings of very suitable size: the former the lunar period or month of about 30 days, the latter the solar period or year of about 365 days, i.e. about 12 of the lunar periods. (As discussed under month and year, these periods exist in several forms; here we are concerned with the obvious period for each, explicitly the synodic month and the tropical year. The week as an entity is essentially artificial, not necessarily of seven days, and of ...

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