Gregorian calendar - Wikipedia, the free encyclopedia
The Gregorian calendar is the internationally accepted civil calendar. It was first proposed by the Calabrian doctor Aloysius Lilius, and decreed by Pope Gregory XIII, after whom the calendar was na...
en.wikipedia.org/wiki/Gregorian_calendar
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Proleptic Gregorian calendar - Wikipedia, the free encyclopedia
The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to dates preceding its official introduction in 1582. The proleptic Gregorian calendar is explicitly require...
en.wikipedia.org/wiki/Proleptic_Gregorian_calendar
Despite its widespread use, the Gregorian calendar has a number of weaknesses. It cannot be divided into equal halves or quarters; the number of days per month is haphazard; and months or even years may begin on any day of the week.
www.infoplease.com/spot/gregorian1.html www.infoplease.com/spot/gregorian1.html
The calendar currently in worldwide use for secular purposes based on a cycle of 400 years comprising 146,097 days, giving a year of average length 365.2425 days. ... The Gregorian calendar was constructed to give a close approximation to the tropical year, which is the actual length of time it takes for the Earth to...
scienceworld.wolfram.com/astronomy/GregorianCalendar.ht... scienceworld.wolfram.com/astronomy/GregorianCalendar.html
The Gregorian calendar is the calendar in current use in the Western world, both as the civil and Christian ecclesiastical calendar. ... The Gregorian calendar replaced the Julian calendar , which had become 10 days out of synchrony with the solar cycle. In October, 1582, 10 days were dropped from the calendar.
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The Gregorian Calendar is a revision of the Julian Calendar which was instituted in a papal bull by Pope Gregory XIII in 1582. The reason for the calendar change was to correct for drift in the dates of signifigant religious observations (primarily Easter) and to prevent further drift in the dates.
www.furrfu.com/magpies/cal_gregorian.html www.furrfu.com/magpies/cal_gregorian.html
In 1582 Pope Gregory XIII (hence the name Gregorian Calendar) ordered ten days to be dropped from October, thus restoring the vernalequinox at least to an average of the 20th of March, close to what it had been at the time of the Council of Nicea.
galileo.rice.edu/chron/gregorian.html galileo.rice.edu/chron/gregorian.html
Three distinct types of calendars have resulted from this situation. A solar calendar, of which the Gregorian calendar in its civil usage is an example, is designed to maintain synchrony with the tropical year.
astro.nmsu.edu/~lhuber/leaphist.html
Two main versions of the Christian calendar have existed in recent times: The Julian calendar and the Gregorian calendar. The difference between them lies in the way they approximate the length of the tropical year and their rules for calculating Easter.
www.tondering.dk/claus/cal/node3.html
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