Gregorian Calendar
The problem with most calendar systems is that they are based on 24-hour days, but the orbital period of the Earth is not an exact multiple of 24. Over time, calenders get out of step with the actual orbital period.
Gregorian calendar
The Gregorian calendar is the calendar currently used in the Western world.
The Gregorian calendar modifies the Julian calendar's regular four-year cycle of leap year
Leap year ...
Gregorian calendar: the calendar first introduced by Pope Gregory XIII in 1582 AD and now the accepted calendar throughout the vast majority of the world.
Gregorian calendar: The most recent in the attempts to make the calendar year correspond to the natural year.
Gregorian calendar -- Introduced in 1582 by Pope Gregory the 13th, this calendar modifies the Julian calendar for greater precision, decreeing that century years such as 1900 are not leap years, ...
Gregorian Calendar
(a) Calendar established with the authority of the Roman Catholic Church by Pope Gregory XIII in 1582.
The Gregorian Calendar
However, the Julian year still differs from the true year of 365.
Gregorian calendar - (n.)
The calendar in current use, with normal years that are 365 days long, with leap years every fourth year except for years that are divisible by 100 but not by 400.
ground state - (n.) ...
- Gregorian Calendar
- History of Clocks and Calendars - Ancient Calendars and Stonehenge
- The Gregorian Calendar - Introduction of the Gregorian Calendar ...
While the Gregorian calendar is widely used in Israel's business and day-to-day affairs, the Hebrew calendar, used by Jews worldwide for religious and cultural affairs, ...
Our current Gregorian calendar makes every effort to align itself with the seasonal year, and does a remarkably good job of it.
calendar year The year of the Gregorian calendar, common years having 365 days and leap years 366 days.
-- Calendar months, the months as adjusted in the common or Gregorian calendar; April, June, September, and November, containing 30 days, and the rest 31, except February, which, in common years, has 28, and in leap years 29.
The Julian calendar remained in use, however, until replaced by the Gregorian calendar in the late sixteenth century. Although the Roman abbot Dionysius Exiguus proposed that the years be numbered from the birth of Christ in about 524 (Boyer 1968, p.
So the world now operates under the Gregorian calendar, though some cultures for non-international commerce purposes use other calendars not related to the western civilization, Christian based calendar.
It was replaced, from 1582, by the Gregorian calendar, by which time it was inaccurate by a total of 10 days. [A84]
(b) The calendar introduced by Julius Caesar in 46 B.C. to replace the Roman calendar.
The names of the months are the same as the Gregorian calendar, except for a "1" or "2" in front to indicate the first or second occurrence of that month (e.g. 1 January, 2 January, 1 February, 2 February, etc.) In the manga and anime series Aria by ...
but there will be no February 29 in the years 1997, 1998, 1999 and 1800, 1900, 2100, 2200, etc. This is called the Gregorian calendar. Using Gregorian calendar, the error accumulated in the next 3000 years will not be more than 1 solar day.
Year, calendar. The mean length of the year according to the Gregorian calendar, 365 days, 5 hours, 49 minutes and 12 seconds.
Year, sidereal. The period taken by the Earth to complete one orbit of the Sun, 365.26 days.
By 1582 that slippage was approaching two weeks and Pope Gregory the 13th therefore decreed a modified calendar, named after him the Gregorian calendar.
The motion of the Sun against the background stars (and the horizon) was used to create calendars, which could be used to regulate agricultural practices. The Gregorian calendar, currently used nearly everywhere in the world, ...
time between successive vernal equinoxes; 365 days, 5 hr, 48 min, 46 sec of mean solar time (see solar time). The tropical year is the basis of the year used in the Gregorian calendar.
the time of Augustus when a 6th additional day every four years was introduced, and it was termed a "natural" year. The Egyptians are credited with the discovery of the natural year, and it formed the basis of the later Julian and Gregorian calendars.
Gregorian calendar
Groombridge Catalogue
grooved terrain
ground-level event (GLE)
Grus (constellation)
Grus Quartet (NGC 7552, NGC 7582, NGC 7590, and NGC 7599)
Guide Star Catalog (GSC)
Gum Nebula
Gusev Crater
gyrofrequency ...
 See also: Calendar, Year, Time, Period, Second
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