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See the text on the CD, Section 10.2.4.4. in the file ch_10_02.txt for a partial list of political entities and areas, organized alphabetically by name, showing the direction and magnitude of displacement of the observed Standard zone and its abbreviation. Areas closer to the equator do not experience the variation in day length common to temperate zone areas, and may not observe advanced time. The actual boundary situation in certain areas is far more complex than can be described here. |
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The SCDTL time zone functions are defined and tested in the test program, DTLT_164.C. |
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In this section, I consider two functions related to the Julian Day number and of historic importance in the Gregorian calendar. |
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B.5.1
lilian_day_number () |
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lilian_day_number () can be considered from various perspectives. From one view, it is the Julian Day number, with its zero point redefined to the beginning of the Gregorian calendar. This function is included for completeness and for those who want to study modified Julian Day number schemes. |
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This function is defined and tested in the test program DTLT_182.C. |
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Following the reconquest of Egypt in A.D. 297, the Roman emperor Diocletian (A.D. 284305) instituted a census for the purpose of taxation and ordered that it be taken every 15 years. The period was related to the term of military service, which was fixed at a maximum of 15 years. The taxation was specifically intended to provide for military retirees. |
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As part of his efforts to stabilize the Roman economy, the Roman emperor Constantine fixed the institution as a fiscal period of 15 years in A.D. 313 and made it effective as of 1 September A.D. 312. The valuation of property was fixed for a period of 15 years for the purposes of taxation. |
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The Cycle of Indiction, or Era of Indiction, came to be a usual means of dating ordinary events and was widely used in the medieval period in Europe. The cycle was used in the 11th century A.D. and later as a form of dating charters and public deeds, where it was used in addition to the Christian era. During the medieval period, the cycle was widely taken as starting on 1 January of the year. |
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This cycle was one of three used by J. J. Scaliger to produce an epoch for the Julian Day number system. |
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This function is defined and tested in the test program DTLT_191.C. |
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