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Topic: Anomalistic year

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	Time Converter
		At the year 46 B.C. he realized a reform in the Roman calendar which implied that the year was fixed to 365 days and a leap year with an extra day would fall every four years and that the moons different phases would not longer have any significance to the calendar.
		An anomalistiskt year is the period of revolution relative to the perihelia, i.e.
		A tropic year is the earths period of revolution relative to the vernal equinox.
	www.convertunit.com /time_converter.php (389 words)

	Year
		A year is the term for any period of time that is derived from the period of the orbit of the Earth around the Sun.
		The actual duration varies from year to year because the motion of the Earth is influenced by the gravity of the Moon and other planets.
		tropical year: the period 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).
	www.ebroadcast.com.au /lookup/encyclopedia/ye/Year.html (612 words)

	year - definition by dict.die.net
		Anomalistic year, the time of the earth's revolution from perihelion to perihelion again, which is 365 days, 6 hours, 13 minutes, and 48 seconds.
		Fiscal year (Com.), the year by which accounts are reckoned, or the year between one annual time of settlement, or balancing of accounts, and another.
		The Jews reckoned the year in two ways, (1) according to a sacred calendar, in which the year began about the time of the vernal equinox, with the month Abib; and (2) according to a civil calendar, in which the year began about the time of the autumnal equinox, with the month Nisan.
	dict.die.net /year (585 words)

	Wikinfo \| Year
		eclipse or ecliptic year: the period for the Sun (as seen from the Earth) to complete one revolution with respect to a node of the Moon's orbit (the points where the Moon's orbit intersects the ecliptic).
		The gaussian year lasts 365.2568983 days, and is derived from the Gaussian gravitational constant that is expressed in units of the solar system.
		Besselian year: this is a tropical year that starts when the mean Sun reaches the ecliptic longitude of 280°.
	www.wikinfo.org /wiki.php?title=Years (782 words)

	Year -- from Eric Weisstein's World of Astronomy
		A Gregorian year (or "calendrical year") is the number of days in a given year of the Gregorian calendar (namely, 365 days in non-leap years and 366 days in a leap year).
		A sidereal year is the time between maximum elevation passages of a fixed star.
		The anomalistic year is the time from one perihelion to the next.
	scienceworld.wolfram.com /astronomy/Year.html (225 words)

	Year (Site not responding. Last check: 2007-10-17)
		The so-called astronomical, or tropical, year is defined as the time elapsing from the appearance of the sun on one of the Tropics, generally at the vernal equinox, until its return to the same place (see Ecliptic).
		The so-called sidereal year is the time taken from the sun's eclipse of a given star to the next solar eclipse of the same star.
		The time elapsing from the arrival of the earth at a particular point in its orbit until its return to the same point is known as the anomalistic year and is equivalent to 365.2596425 mean solar days, or 365 days, 6 hr, 13 min, 53.1 sec.
	skybooksusa.com /time-travel/timeinfo/year.htm (215 words)

	year
		An anomalistic year is the interval between successive passages of Earth through perihelion or aphelion.
		An eclipse year is the time between successive returns of the Sun to the same node of the Moon’s orbit.
		Nineteen eclipse years are 6585.78 days which is almost exactly the same as the ancient Saros cycle of 6585.32 days –; the period that separates eclipses in a given series.
	www.daviddarling.info /encyclopedia/Y/year.html (312 words)

	The Sirius Research Group
		The anomalistic year refers to the repetition of the planet's "mean anomaly" and corresponds to the mean interval between successive passages of its perihelion or closest approach to the Sun.
		The tropical year, often but imprecisely described as the mean interval between successive passages of the vernal equinox, is defined by astronomers as the slightly different interval during which the Sun's mean longitude, referred to the mean equinox of date, increases by 360°.
		(The tropical year is shortened with respect to the sidereal year by the longitudinal precession of the planet's pole vector, and can be estimated as the average of the four mean intervals for the repetition of each of the equinox and solstice seasons.) All these measures of the orbital year also change slowly with time.
	siriusresearchgroup.com /archives/year.shtml (850 words)

	Year
		The orbit of the Earth is elliptical; the extreme points, called apsides, are the perihelion, where the Earth is closest to the Sun (January 2 in 2000), and the aphelion, where the Earth is furthest from the Sun (July 2 in 2000).
		A heliacal year or sidereal year is the interval between the heliacal risings of a star.
		The Gaussian year is the sidereal year for an ideal planet governed by the Gaussian gravitational constant.
	www.askfactmaster.com /Yr (1058 words)

	The Tropical and the Anomalistic Year
		A tropical year is the time it takes the Sun to appear to travel around the sky from a given point of the tropical zodiac back to that same point in the tropical zodiac.
		A tropical year is fulfilled when the Earth's axis completes a full cycle of angles with respect to the line joining the center of the Earth to the Sun.
		A mean tropical year can thus be thought of as a constant mean anomalistic year, less a small variable period of time (between 24 and 26 minutes of an hour), which depends for its exact duration upon the position in the ellipse from which we choose to begin our mean tropical year.
	www.hermetic.ch /cal_stud/cassidy/tropanom.htm (848 words)

	year
		The tropical year is the interval between one spring (or autumn) equinox and the next.
		The tropical year is not the length of the year in the tropics; it has nothing to do with Somerset Maugham, sunny beaches or banana plantations.
		The anomalistic year is the interval between the instant when Earth's orbit brings it closest to the sun (perihelion) and the next such instant.
	www.sizes.com /time/year.htm (563 words)

	Tropical & anomalistic year
		A tropical year is the time it takes the sun to appear to travel around the sky from a given point of the tropical zodiac back to that same point in the tropical zodiac.
		A tropical year is fulfilled when the Earth's axis completes a full cycle of angles with respect to the line joining the center of the Earth to the sun.
		A mean tropical year can thus be thought of as a constant mean anomalistic year, less a small variable period of time (between 24 and 26 minutes of an hour), which depends for its exact duration upon the position in the ellipse from which we choose to begin our mean tropical year.
	home.earthlink.net /~scassidy/tropanom.html (844 words)

	Glossary of Calendrical Terms
		She was referring to divorce of the British Princess Royal, a separation of the Duke and Duchess of York, newspaper photographs of the latter (topless) and a fire at Windsor Castle.
		Anomalistic year length is 365.25964 days, about 27 minutes longer than the mean tropical year.
		For example, year 2000 was a leap year but in 2100, 2200 and 2300 February will have only 28 days.
	www.12x30.net /terms.html (2183 words)

	Gregorian year. Common units. Time Conversion Chart
		This page contains conversion chart from "Gregorian year" to other units.
		To make online conversions between units please proceed to Time conversion page
		Please provide link to Convert-me.Com when using information acquired from this site.
	www.convert-me.com /en/convert/units/time/time.year.en.html (127 words)

	Ephemeris Time and Ancient Numbers
		The variations from one kind of year to another are slight variations in the number of seconds between their length.
		These latter expressions represent the expression of Earth's years in ephemeris time, and were used previously in order to present a more precise image of the numbers relating to the different types of years regarding Earth's orbital time.
		But, as we compare the various combinations of proportion between the distinct years for Earth's orbital times, the possibility of a relevancy between the ancient reckoning numbers and events in the solar system appear to be more by design than by happenstance.
	www.earthmatrix.com /number/ephemeris_time_ancient.html (2025 words)

	Anomalistic Year -- from Eric Weisstein's World of Astronomy
		Anomalistic Year -- from Eric Weisstein's World of Astronomy
		The time from one perihelion passage to another for the Earth.
		The anomalistic year was 365.259635 days long in 1994-2000.
	scienceworld.wolfram.com /astronomy/AnomalisticYear.html (39 words)

	THE YEARS
		Using that frame tied to the rest of the Universe, we define the sidereal year as the time that elapses between one instant when Earth's center crosses that line and the next instant when Earth's center crosses the line.
		The calendar year, consisting of 365 days into which we so insert leap days at the end of February that March 21 falls on or as near as we can make it to the vernal equinox.
		That exceeds the length of the mean tropical year by 27 seconds, which means the calendar year loses one day over the vernal equinox every 3225.463 years.
	www.bado-shanai.net /Astrogation/Theyears.htm (817 words)

	Seasonal year - Wikipedia, the free encyclopedia
		This means that calendars are based on astronomical years (which are regular enough to be easily measured) as surrogates for the seasonal year.
		A study of temperature records over the past 300 years (David J. Thomson, SCIENCE, April 1995) suggests that the seasonal year is governed by the anomalistic year rather than the tropical year.
		The seasons can be considered to be an oscillating system driven by two inputs with slightly different frequencies: the total input of energy from the sun varies with the anomalistic year, while the distribution of this energy between the hemispheres varies with the tropical year.
	en.wikipedia.org /wiki/Seasonal_year (318 words)

	Julian year (astronomy) - Wikipedia, the free encyclopedia
		Julian years are used primarily for convenience in ephemeris work where stating a number of days would be unwieldy (for instance, it is easier to express the orbital period of Pluto as 248 Julian years rather than 90,590 days).
		The "year" used in the definition of light year is a Julian year (note that a light year is a unit of distance, not time).
		Julian years are not to be confused with the Julian day (or Julian date), which is also used in astronomy.
	en.wikipedia.org /wiki/Julian_year_(astronomy) (690 words)

	Celestial Night during the Year (Site not responding. Last check: 2007-10-17)
		However, the anomalistic year (the time it takes to revolve around the sun, perihelion to perihelion say) does not coincide with the tropical year (the time for the Earth to complete a revolution such that its axis is appearing to point in the same zodiac, solstice to solstice say).
		The lag is small, but it does mean that the constellations are not in the same exact location in the night sky at a particular time of night in a particular time of year.
		On average the anomalistic year is 25min longer than a tropical year, so over 58 years there is a regression of 1 day.
	www.newton.dep.anl.gov /askasci/ast99/ast99604.htm (208 words)

	No Title (Site not responding. Last check: 2007-10-17)
		the tropical year is the interval between two successive transits of the mean sun through the mean equinox.
		The ANOMALISTIC YEAR is the period of the Sun relative to the apse line (major axis) ie.
		Since the apse line has a direct motion in the plane of the ecliptic of 11''.25 per year the anomalistic year is slightly longer than the sidereal year.
	www.sun.rhbnc.ac.uk /~uhap045/290/290note2/290note2.html (430 words)

	Year - definition from Biology-Online.org (Site not responding. Last check: 2007-10-17)
		The civil, or legal, year, in England, formerly commenced on the 25th of march.
		A year's mind, a time to be allowed for an act or an event, in order that an entire year might be secured beyond all question.
		A season of the year, springtime, a part of the day, an hour, a year, Zend yare year.
	www.biology-online.org /dictionary/Year (244 words)

	The 1,800-year oceanic tidal cycle: A possible cause of rapid climate change -- Keeling and Whorf 97 (8): 3814 -- ...
		period of the anomalistic year with one-third of the period of
		that the assumption of a constant anomalistic year exaggerates
		years, the latter a manifestation of planetary resonances (13).]
	www.pnas.org /cgi/content/full/070047197 (4707 words)

	Extra Year (Site not responding. Last check: 2007-10-17)
		When we say "the earth goes around the sun once each year" there are actually several different ways we can measure this, and thus there are several different kinds of "year" we could use.
		What we usually do, though, is measure the time between one vernal equinox and the next one - the Tropical year.
		Since the earth's orbit precesses a little and since the earth's axis also precesses a little, these three kinds of year don't match exactly.
	www.polaris.iastate.edu /NorthStar/Unit4/Extra.htm (199 words)

	anomalistic year concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-17)
		anomalistic year concept from the Astronomy knowledge base
		Next year: Besselian year Up: year Previous year: tropical year
		has definition A period of time based on the revolution of the Earth around the Sun, where a year is defined as the mean interval between successive passages of the Earth through perihelion.
	www.site.uottawa.ca:4321 /astronomy/anomalisticyear.html (76 words)

	ASTRONOMY FORMULAE by Amitava Chakraborty
		The Ephemeris Second, the unit of measure of Ephemeris Time, is defined in terms of the tropical year 1900, the fundamental ephemeris epoch.
		is an eclipse cycle of 242 nodal months, 223 synodic periods, 239 anomalistic months and 17 eclipse years.
		is a cycle that produces the same phase of the moon on the same date of the tropical year every 19 years.
	www.geocities.com /camitava0321/astronomy/formulae.htm (916 words)

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