Kuwaiti algorithm: Difference between revisions
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#REDIRECT [[Tabular Islamic calendar]] |
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[[Category:Islamic calendar]] |
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The '''Kuwaiti algorithm''' is used by [[Microsoft]] to convert between [[Gregorian calendar]] dates and [[Islamic calendar]] dates.<ref>[http://www.microsoft.com/globaldev/DrIntl/columns/002/default.mspx#EAD Hijri Dates in SQL Server 2000] from Microsoft{{dead link}}</ref><ref>Kriegel, Alex, and Boris M. Trukhnov. SQL Bible. Indianapolis, IN: Wiley, 2008. Page 383.</ref> There is no fixed correspondence defined in advance between the Gregorian [[solar calendar]] and the Islamic [[lunar calendar]], since the latter is defined by the visibility of the new moon by religious authorities and can therefore vary by a day or two, depending on the particular Islamic authority, weather conditions, and other variables. As an attempt to make conversions between the calendars somewhat predictable, Microsoft claims to have created this [[algorithm]] based on statistical analysis of historical data from [[Kuwait]]. |
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According to Robert Harry van Gent at Utrecht University, the so-called "Kuwaiti algorithm" is simply an implementation of a standard [[tabular Islamic calendar]] algorithm used in Islamic astronomical tables since the 11th century.<ref>"Microsoft gives no details on the mathematics of the “Kuwaiti Algorithm” but one can easily demonstrate that it is based on the standard arithmetical scheme (type Ia) which has been used in Islamic astronomical tables since the 11th century CE. Naming this algorithm the “Kuwaiti Algorithm” is thus historically incorrect and should be discontinued." [http://www.staff.science.uu.nl/~gent0113/islam/islam_tabcal.htm Islamic-Western Calendar Converter (Based on the Arithmetical or Tabular Calendar)]</ref> |
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==References== |
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[[Category:Specific calendars]] |
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[[Category:Calendar algorithms]] |
[[Category:Calendar algorithms]] |
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Revision as of 07:28, 11 April 2012
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