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Topic: Proleptic Gregorian calendar

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	Proleptic Gregorian calendar - Wikipedia, the free encyclopedia
		The proleptic Gregorian calendar is produced by extending the Gregorian calendar to dates preceding its official introduction in 1582.
		From 1 March 200 to 28 February 300 it corresponds to the Julian calendar.
		Note that the Julian calendar was in actual use after AD 4, until 1582 or later (see From Julian to Gregorian), so historians and astronomers prefer to use the actual Julian calendar during that period.
	en.wikipedia.org /wiki/Proleptic_Gregorian_calendar (289 words)

	Gregorian calendar - Wikipedia, the free encyclopedia
		The Gregorian Calendar was devised both because the mean year in the Julian Calendar was slightly too long, causing the vernal equinox to slowly drift backwards in the calendar year, and because the lunar calendar used to compute the date of Easter had grown conspicuously in error as well.
		The Gregorian solar calendar is an arithmetical calendar.
		Gregorian reform of the calendar: Proceedings of the Vatican conference to commemorate its 400th anniversary, 1582-1992, ed.
	en.wikipedia.org /wiki/Gregorian_calendar (5561 words)

	Proleptic Gregorian Calendar: Definition and Links by Encyclopedian.com
		...Proleptic Gregorian Calendar Proleptic Gregorian Calendar The proleptic...(likewise in the proleptic Julian calendar).
		The proleptic Gregorian calendar is produced by extending the Gregorian Calendar to dates preceding its official introduction.
		This is the convention used in the "astronomical Gregorian calendar".
	www.encyclopedian.com /pr/Proleptic-Gregorian-calendar.html (350 words)

	Gregorian calendar (Site not responding. Last check: 2007-10-19)
		A modification of the Julian calendar it was first proposed by Neapolitan doctor Aloysius Lilius and promulgated by the eponymous Pope Gregory XIII on February 24 1582 (Note: The document was dated 1581 the year was at that time taken commence in March).
		The Gregorian calendar was devised because the year in the Julian Calendar was a too long causing the Vernal equinox to slowly drift earlier in the year.
		But rather than proceeding directly to Gregorian calendar Sweden decided to first revert the Julian calendar for a time before adopting the Gregorian calendar in one fell in 1753 where February 17 was followed by March 1.
	www.freeglossary.com /Gregorian_Calendar (1785 words)

	Gregorian calendar - Encyclopedia, History, Geography and Biography
		The Gregorian calendar is the calendar that is used nearly everywhere in the world.
		The Gregorian calender system dealt with the problem by adding a certain number of days to bring the calender back into synchronization with the seasons, and then slightly shortening the average number of days in a calender year, by omitting three Julian leap-days every 400 years.
		Sweden started to make the change from the OS calendar and towards the NS calendar in 1700, but it was decided to make the (now 11 day) adjustment gradually, by excluding the leap days (29 February) from each of 11 successive leap years, 1700 to 1740.
	www.arikah.com /encyclopedia/Gregorian_calendar (5520 words)

	Gregorian Calendar : QuicklyFind Info (Site not responding. Last check: 2007-10-19)
		A modification of the Julian calendar, it was first proposed by Neapolitan doctor Aloysius Lilius, and adopted by Pope Gregory XIII on February 24, 1582 (the document was dated 1581 on account of the pope starting the year in March).
		The Gregorian calendar was invented because the mean year in the Julian Calendar was a little too long, causing the Vernal equinox to slowly drift earlier in the calendar year.
		When the new calendar was put in use, to correct the error already accumulated in the thirteen centuries since the council of Nicaea, a deletion of ten dates was made passing from October 4, 1582 directly to October 15, 1582.
	www.quicklyfind.com /info/Gregorian_Calendar.htm (1299 words)

	Gregorian calendar Summary
		Calendar reform was, after all, primarily a religious concern, and at this time, the Pope was acknowledged throughout Europe as the head of the Christian religion.
		This brought the calendar into step with countries that had adopted the Gregorian calendar, with the exception that Easter occasionally fell on different dates under the two calendars (this problem was corrected later in the century).
		The Gregorian Calendar was devised because the mean year in the Julian Calendar was slightly too long, causing the vernal equinox to slowly drift backwards in the calendar year.
	www.bookrags.com /Gregorian_calendar (6357 words)

	sociology - Proleptic Julian calendar
		The proleptic Julian calendar is produced by extending the Julian calendar to dates preceding its official introduction in 45 BC.
		This is the convention used in the "astronomical Julian calendar".
		A calendar obtained by extension earlier in time than its invention or implementation is called the "proleptic" version of the calendar, and thus we obtain the proleptic Gregorian Calendar.
	www.aboutsociology.com /sociology/Proleptic_Julian_calendar (238 words)

	The Julian and Gregorian Calendars
		In fact a non-Gregorian calendar reform (involving a 33-year cycle and a prime meridian running through Virginia) would have stabilized the vernal equinox at March 21 for the whole world, but this possibility (assuming it was considered by the Pope) was rejected, presumably on political grounds.
		The Gregorian Calendar was adopted immediately upon the promulgation of Pope Gregory's decree in the Catholic countries of Italy, Spain, Portugal and Poland, and shortly thereafter in France and Luxembourg.
		Whereas in the Gregorian Calendar a century year is a leap year only if division of the century number by 4 leaves a remainder of 0, in the Eastern Orthodox system a century year is a leap year only if division of the century number by 9 leaves a remainder of 2 or 6.
	www.hermetic.ch /cal_stud/cal_art.html (3479 words)

	ISO C 200X Proposal: Calendar Date Functions
		The most common calendric system in use is the Gregorian calendar, which was first established in 1582 by an edict from Pope Gregory XIII in several Catholic European countries, and by the end of the 20th century had been adopted by almost all of the countries of the world.
		For the Gregorian calendar, the first day of the week is a Monday, as per the rules of ISO 8601 (see reference [3]).
		Implementations that support a Gregorian calendar with a wider range of year numbers are encouraged to implement the proleptic Gregorian calendar, which assumes that the rules for leap days are in effect for all dates prior to the present date.
	david.tribble.com /text/c0xcalendar.html (11555 words)

	Astronomical Time Keeping
		In astronomy and for historical purposes the Julian calendar is also applied to epochs earlier than the year 46 BC when this calendar was not yet defined and the people of that time could not know their date in it.
		Calendar of the French revolution: This calendar was designed by S. Marechal in 1787 and established in post-revolutionary France on October 5, 1793.
		Civilian calendar of the Federal Republic of Germany: With typical German thoroughness, this calendar is standardized in the norm DIN 1355.
	www.maa.mhn.de /Scholar/calendar.html (3253 words)

	dictionary - Proleptic Gregorian Calendar
		This is the convention used in the "astronomical" Gregorian calendar and in the international standard date system, ISO 8601.
		Note that because the Julian calendar was in actual use between 4 and 1582, historians and astronomers prefer to use it.
		Likewise, the proleptic Julian calendar is used to specify dates before AD 4, its first quadrennial leap year (leap years between 45 BC and AD 4 were irregular).
	www.medicalrace.com /dictionary/Proleptic_Gregorian_calendar (189 words)

	5.2 calendar -- General calendar-related functions
		By default, these calendars have Monday as the first day of the week, and Sunday as the last (the European convention).
		This matches the definition of the "proleptic Gregorian" calendar in Dershowitz and Reingold's book "Calendrical Calculations", where it's the base calendar for all computations.
		The earliest year for which a calendar can be generated is platform-dependent.
	www.python.org /doc/current/lib/module-calendar.html (900 words)

	Proleptic Gregorian calendar - Facts, Information, and Encyclopedia Reference article (Site not responding. Last check: 2007-10-19)
		Proleptic Gregorian calendar - Facts, Information, and Encyclopedia Reference article
		Note that the Julian calendar was in actual use after AD 4, until 1582 or later (see From Julian to Gregorian in Julian calendar), so historians and astronomers prefer to use the actual Julian calendar during that period.
		Likewise, the proleptic Julian calendar is used to specify dates before AD 4, its first quadrennial leap year (leap years between 45 BC and AD 4 were irregular, see Leap years error in Julian calendar).
	www.startsurfing.com /encyclopedia/p/r/o/Proleptic_Gregorian_Calendar_c867.html (210 words)

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