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|L. E. Doggett|
|An introduction to calendars: what they are; astronomical bases of calendars; calendar reform and accuracy; historical eras and chronology; the Gregorian Calendar - ecclesiastical rules, history; the Hebrew Calendar - rules, Determining Tishri 1, Reasons for the Dehiyyot, Determining the Length of the Year, history; the Islamic Calendar; the Indian Calendar; the Chinese Calendar; the Julian Calendar. Information reprinted from the Explanatory Supplement to the Astronomical Almanac, P. Kenneth Seidelmann, editor, with permission from University Science Books, Sausalito, CA.|
|Levels:||Middle School (6-8), High School (9-12), College|
|Math Topics:||Calendars/Dates/Time, History and Biography|
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