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Topic: Astronomical year

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	Year - Facts, Information, and Encyclopedia Reference article
		A seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, the flowering of a species of plant, the first frost, or the first scheduled game of a certain sport.
		A tropical year is the time for the Earth to complete one revolution with respect to the framework provided by the intersection of the ecliptic (the plane of the orbit of the Earth) and the plane of the equator (the plane perpendicular to the rotation axis of the Earth).
		An event moving toward perihelion recurs with a decreasing period from year to year; an event moving toward aphelion recurs with an increasing period from year to year.
	www.startsurfing.com /encyclopedia/y/e/a/Year.html (1622 words)

	CalendarHome.com - Astronomical year numbering - Calendar Encyclopedia
		Thus, it has a year 0 and the years before that are designated with a minus sign '−'.
		A zero year was first used by the eighteenth century French astronomers Philippe de La Hire (1702) and Jacques Cassini (1740).
		However, both of these astronomers used the applicable BC/AD designations of Latin and French with their year zero, thus near the epoch the years were designated 2 BC, 1 BC, 0, AD 1, AD 2, etc. They did not use −/0/+.
	encyclopedia.calendarhome.com /Astronomical_year_numbering.htm (341 words)

	Encyclopedia :: encyclopedia : Astronomical year numbering (Site not responding. Last check: 2007-11-01)
		Astronomical year numbering is based on BCE/CE (or BC/AD) year numbering, but follows normal decimal integer numbering more strictly.
		So the year 1 BCE is numbered 0, the year 2 BCE is numbered −1, and in general the year n BCE is numbered (1−n).
		The numbers of CE years are not changed, but CE (or AD) is not used, being replaced by either no sign or a positive sign.
	www.hallencyclopedia.com /Astronomical_year_numbering (257 words)

	[No title] (Site not responding. Last check: 2007-11-01)
		Astronomical year numbering refers to an alternative method of numbering years in relation to the Common Era.
		In astronomical year numbering, the year 1 BCE becomes 0, the year 2 BCE becomes -1, and in general any given year n BCE becomes -(n-1).
		It is more convenient to have a year 0 when subtracting years and computing time intervals across the epoch.
	www.wikiwhat.com /encyclopedia/a/as/astronomical_year_numbering.html (87 words)

	The Julian and Gregorian Calendars
		In that case 1 A.D. is the second year, and 999 A.D. is the 1000th year, of the first Christian millennium, implying that 1999 A.D. is the final year of the second Christian millennium and 2000 A.D. the first year of the third.
		In other words, a year which is divisible by 4 is a leap year unless it is divisible by 100 but not by 400 (in which case it is not a leap year).
		Astronomers designate years prior to 1 A.D. by means of zero and negative numbers, according to the sequence of numbers..., -2, -1, 0, 1, 2,....
	www.hermetic.ch /cal_stud/cal_art.html (3479 words)

	Reference.com/Encyclopedia/Astronomical year numbering
		Astronomical year numbering is based on AD/CE year numbering, but follows normal decimal integer numbering more strictly.
		The numbers of AD/CE years are not changed, but AD/CE is not used, being replaced by either no sign or a positive sign.
		However, both of these astronomers used the applicable AD/BC designations of Latin and French with their year zero, thus near the epoch the years were designated 2 BC, 1 BC, 0, 1 AD, 2 AD, etc. They did not use −/0/+.
	www.reference.com /browse/wiki/Astronomical_year_numbering (360 words)

	Astronomical Year Numbering (Site not responding. Last check: 2007-11-01)
		Please look for Astronomical Year Numbering, Science Games and Science Games Online to find more Astronomical Year Numbering information.
		The Julian Calendar, the Gregorian reform and its adoption, astronomical year numbering, the Julian and the Gregorian Proleptic Calendars, and...
		Millennium - Viewpoint 2: xx00-xx99, Astronomical year numbering, Calendar and List of calendars, Century, Decades, Millennialism,...
	www.astronomicalyearnumbering.info (322 words)

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