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A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Calendrical calculation is one of the five major Savant syndrome characteristics. Some examples of calendrical calculations: * Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see the section on calculation in that article for details). * The number of days between two dates, which is simply the difference in their Julian day numbers. * The date of a religious holiday, like Easter (the calculation is known as Computus) or Passover, for a given year. * Converting a date between different calendars. For instance, dates in the Gregorian calendar can be converted to dates in the Islamic calendar with the Kuwaiti algorithm. * Calculating the day of the week. ==References== * Edward M. Reingold and Nachum Dershowitz. ''Calendrical Calculations''. Cambridge University Press; 3 edition (December 10, 2007). ISBN 978-0-521-88540-9 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Calendrical calculation」の詳細全文を読む スポンサード リンク
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