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Jewish Law (Halahcha) mandates that only a Hebrew Calendar (luach) may be used to calculate these dates of anticipation and separation. This is imperative since the Hebrew day begins at sunset the evening before. Using a solar calendar, or secular calendar will yield inaccurate calculations.
Knuckles are counted as 31 days, depressions between knuckles as 30 (or 28/29) days. One starts with the little finger knuckle as January, and one finger or depression at a time is counted towards the index finger knuckle (July), saying the months while doing so.
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A kʼatun (/ ˈ k ɑː t uː n /, [1] Mayan pronunciation:) is a unit of time in the Maya calendar equal to 20 tuns or 7200 days, equivalent to 19.713 tropical years. It is the second digit on the normal Maya long count date. For example, in the Maya Long Count date 12.19.13.15.12 (December 5, 2006), the number 19 is the kʼatun.
The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.
A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).