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Topic: Sidereal year


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In the News (Sat 16 Dec 17)

  
  sidereal year — FactMonster.com
sidereal year, time required for the earth to complete an orbit of the sun relative to the stars.
anomalistic year - anomalistic year anomalistic year, time required for the earth to go from the perihelion point...
year - year year, timerequired for the earth to complete one orbit about the sun.
www.factmonster.com /ce6/sci/A0845134.html   (146 words)

  
  Year - Wikipedia, the free encyclopedia
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).
It differs from the sidereal year for stars north or south of the ecliptic because of the significant angle (23.5°) between Earth's celestial equator and the ecliptic.
en.wikipedia.org /wiki/Year   (1571 words)

  
 Year   (Site not responding. Last check: 2007-10-26)
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, or the flowering of a species of plant.
The eclipse year or ecliptic year is the time 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).
A heliacal year or sidereal year is the interval between the heliacal risings of a star.
www.bidprobe.com /en/wikipedia/y/ye/year.html   (969 words)

  
 Year Information - TextSheet.com   (Site not responding. Last check: 2007-10-26)
sidereal year: the actual period for the Earth to complete one revolution of its orbit, as measured in a fixed frame of reference (such as the fixed stars, Latin sidus).
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.medbuster.com /encyclopedia/y/ye/year.html   (702 words)

  
 Sidereal year -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-26)
The sidereal year is the orbital period of (The 3rd planet from the sun; the planet on which we live) Earth.
The sidereal year is (Click link for more info and facts about 20 minute) 20 minutes and (Click link for more info and facts about 24 second) 24 seconds longer than the (The time for the earth to make one revolution around the sun, measured between two vernal equinoxes) tropical year.
One sidereal year is roughly equal to 1 + 1/26000 or 1.000039 tropical years.
www.absoluteastronomy.com /encyclopedia/s/si/sidereal_year.htm   (417 words)

  
 AllRefer.com - sidereal year (Astronomy, General) - Encyclopedia
sidereal year, time required for the earth to complete an orbit of the sun relative to the stars.
The sidereal year is 365 days, 6 hr, 9 min, 9.5 sec of mean solar time (see solar time).
It is 20 min longer than the tropical year because of the precession of the equinoxes; for this reason, the sidereal year does not stay in step with the seasons.
reference.allrefer.com /encyclopedia/S/sidrlyr.html   (186 words)

  
 The Sirius Research Group
The sidereal year is said to be the truest measure for a complete period of revolution of the Earth around the sun.
Sidereal year: the period during which Earth makes a complete 360° revolution in its orbit around the sun, as measured with respect to the position of the fixed stars or inertial space.
The length of the tropical year is derived from Newcomb's tables of the Sun, whereas the length of the sidereal year depends upon the adopted value of the precession.
siriusresearchgroup.com /publications/Paper.shtml   (1318 words)

  
 CalendarHome.com - Sidereal year - Calendar Encyclopedia
The sidereal year is the time for the Sun to return to the same position in respect to the stars of the celestial sphere.
The sidereal year is the orbital period of Earth.
The sidereal year is 20 minutes and 24 seconds longer than the tropical year.
encyclopedia.calendarhome.com /Sidereal_year.htm   (332 words)

  
 Tropical year - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-26)
A tropical year is the length of time that the Sun, as viewed from the Earth, takes to return to the same position along the ecliptic (its path among the stars on the celestial sphere).
Because the vernal equinox moves back along the ecliptic due to precession, a tropical year is shorter than a sidereal year (in 2000, the difference was 20.409 minutes; it was 20.400 min in 1900).
As the equinox completes a full circle with respect to the perihelion (in about 21,000 years), the length of the tropical year as defined with reference to a specific point on the ecliptic oscillates around the mean tropical year.
www.leessummit.us /project/wikipedia/index.php/Tropical_year   (1767 words)

  
 Lunisolar calendar - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-26)
If it is taken to be a sidereal year then it will give us an idea of the constellation near which the full moon may occur.
This is normally done by having a calendar year that corresponds to a solar year and a month which corresponds to a lunation so that the day of month indicates the moon phase.
If the lunisolar calendar is defined to have a year that corresponds to the tropical year then the month of the year (which corresponds to a lunation) will roughly indicate the season, and the day of month will roughly indicate the moon phase.
www.pineville.us /project/wikipedia/index.php/Lunisolar_calendar   (486 words)

  
 Year - Simple English Wikipedia
The year starts on January 1 in the Gregorian calendar, but a fiscal year or a school year can start on a different day of the year.
a tropical year is the time between two vernal equinoxes, the first day of spring when the lengths of daylight and night are the same.
a sidereal year measures the time between when a selected fixed star is highest in the night sky.
simple.wikipedia.org /wiki/Year   (290 words)

  
 SIDEREAL YEAR FACTS AND INFORMATION
The sidereal year is the time for the Sun to return to the same position in respect to the stars of the celestial_sphere.
The sidereal year is 20 minutes and 24 seconds longer than the tropical_year.
In Hesiod's ''Works_and_Days'', the times of the year for sowing, harvest, and so on are given by reference to the first visibility of stars.
www.dontpayyourtaxes.com /sidereal_year   (302 words)

  
 Julian year - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-26)
A Julian year is the length of an average year in the Julian calendar, 365.25 days.
Astronomers still use the Julian year as a fundamental unit for ephemeris work, since it provides a quick and simple conversion to Julian dates.
Note a Julian year is not the same as a Gregorian calendar year, a tropical year or a sidereal year.
www.hackettstown.us /project/wikipedia/index.php/Julian_year   (142 words)

  
 Orbital period   (Site not responding. Last check: 2007-10-26)
The sidereal period is the time that it takes the object to make one full orbit around the sun, relative to the stars.
Copernicus devised a mathematical formula to calculate a planet's sidereal period from its synodic period.
E = the sidereal period of Earth (a sidereal year, not the same as a tropical year)
www.bidprobe.com /en/wikipedia/o/or/orbital_period.html   (257 words)

  
 weather.com - Glossary
A sidereal year, which is the time it take for the earth to make one absolute revolution around the sun, is 365 days, 6 hours, 9 minutes, and 9.5 seconds.
The tropical year, also called the mean solar year, is dependent on the seasons.
It is the interval between two consecutive returns of the sun to the vernal equinox.
www.weather.com /glossary/y.html   (150 words)

  
 Months, Seasons and Years
Years are defined as the length of time in days that is required by our tilted Earth to make one complete revolution around the sun.
The different amount of time required by the sidereal year results from the Earth's wobbling like a top as it spins on its axis while orbiting the sun.
This was said to have been the case in the so-called Golden Age as described by ancient writers.
www.12x30.net /months.html   (896 words)

  
 Prose, A Brief History of Our Calendar
But they soon realized that a year of twelve lunar months - actually 354.37 days - began to slip as far as getting the same day of the month occurring at the same time of the year - the synodic year was not exactly the same length as the the year based on the sun.
The Gregorian year accounts for a year of 365d 5h 48m 20s, which means it is 26 seconds a year too long, or it gains 0.12 days every 400 years.
"Sidereal year:" The time for the earth to circle the sun relative to a fixed celestial object, such as a star.
www.stiltner.org /book/bookcale.htm   (1865 words)

  
 The Sirius Research Group
At issue is the physical time interval of a so-called sidereal year, said to be the truest measure of earth's complete period of revolution around the sun relative to inertial space.
Note: Since the 'mean solar day' and the 'mean sidereal day' are rigorously related by mathematical formula, the precise time interval of the sidereal year (or tropical year) had been determined in practice by using meridian transit instruments to measure the rotation of the Earth with respect to certain fixed stars.
The IAU's argument that the sidereal year depends upon an adopted value of precession, whereas the length of the tropical year is derived from Newcomb's tables of the Sun, has a major scientific flaw.
siriusresearchgroup.com /archives/IAU.shtml   (1123 words)

  
 Define Day : powered by In Dictionary (InDicitonary.com)   (Site not responding. Last check: 2007-10-26)
See under Clock, Day, etc. Sideral time, time as reckoned by sideral days, or, taking the sidereal day as the unit, the time elapsed since a transit of the vernal equinox, reckoned in parts of a sidereal day.
This is, strictly, apparent sidereal time, mean sidereal time being reckoned from the transit, not of the true, but of the mean, equinoctial point.
Sidereal day, the interval between two successive transits of the first point of Aries over the same meridian.
www.indictionary.com /define/Day   (1446 words)

  
 Binary Research Institute
A Tropical Year is defined as the annual interval from equinox to equinox, while a Sidereal Year is the time required for the Earth to re-align with the fixed stars.
The combination of these two principal forces is supposed to cause the pole to shift clockwise by the observable 50.29 arc seconds per year, meaning the equinox would arrive 50.29 arc seconds short of that point in the Earth’s orbit path that the equinox occurred at in the prior year.
Interestingly, if one plugs in only sidereal data they also show the Earth moves 360 degrees relative to the fixed stars in a sidereal year, yet this orbit path of the Earth around the Sun takes 20 minutes longer and is 22,000 miles wider in circumference.
www.binaryresearchinstitute.org /bri/research/evidence/lunarcycle.shtml   (1137 words)

  
 Astronomy Without a Telescope
One sidereal period later (23 hours 56 minutes) or one true rotation period later, the arrow is again pointing toward the star.
The Earth's sidereal day is always 23 hours 56 minutes long because the number of degrees the Earth spins through in a given amount of time stays constant.
A year is defined as the orbital period of the Earth.
www.astronomynotes.com /nakedeye/s7.htm   (1155 words)

  
 364 Sidereal Year
In 3 years there are 1,092 days, and in 5 years 1,820 days, so that in 8 years there are 2,912 days." It seems clear that the person who wrote the above passage also believed that the 364 days was not just a 52-week calendar year, but was the actual length of a sidereal year.
That is, they counted the year as 365 days from then on and did not factor in leap year.
Then perhaps 30 years later in 2777 BC God may have moved the sun 180° around the earth and this be what Herodotus noted.
sunnyokanagan.com /joshua/sidereal.html   (845 words)

  
 Time and the calendar   (Site not responding. Last check: 2007-10-26)
The hour angle of the true sun is not regular due primarily to the ellipticity of the Earth's orbit and to the obliquity of the ecliptic.
The new calendar approximated the tropical year by having three common years each 365 days in length and a leap year every fourth year (every year divisible by four).
By 1582 the 11m 14s per year difference between the Julian 365.25 day year and the tropical year brought the vernal equinox back to March 11.
www.physics.uq.edu.au /people/ross/phys2081/time/calendar.htm   (666 words)

  
 Hindu Calendar   (Site not responding. Last check: 2007-10-26)
Obliquity of the Ecliptic (angle of ecliptic and Celestial Equator)- 23 degrees 27'
The Saura[1] Varsha or the solar year has been precisely measured as equal to 365.2421896698 days long, although it is gradually becoming shorter by about half a second per century.
Since the names of the months[2] were based on the Nakshatra position of the Full Moon, I have every reason to believe that the months were initiated from the end of the full Moon called Poornima (when the Satya Narayana Vrata is performed and a person promises to abide by Dharma and be truthful).
srath.com /lectures/hinducalendar.htm   (1799 words)

  
 Articles - Buddhist calendar   (Site not responding. Last check: 2007-10-26)
The average year is 365.25875 days reckoned from the mahayuga of 4,320,000 years, simplified to 292,207 days every 800 years by removing a common factor of 5400 from the total days and years.
This year is slightly longer than the modern sidereal year and is substantially longer than the modern tropical year.
All years are elapsed/expired/complete years, thus their epochal year is year 0, not year 1, because a complete year had not yet elapsed during it.
gaple.com /articles/Buddhist_calendar?mySession=52d8ba1126b8ea736f51...   (649 words)

  
 Yavin IV Astronomy in a bit more depth
At this time, the Massassi temple is once again at sidereal zero at the same time as Yavin IV is at the sidereal-zero point in its orbit about Yavin.
On New Year's Day, Yavin IV and Yavin are once again lined up on sidereal-zero at the sidereal-zero point of Yavin's orbit about the sun, for the first time after 637 standard years.
4745, the number of sidereal days in a sidereal year, is evenly divisible by the numbers 5, 7, 13, 49, and 73.
home.san.rr.com /crocuta/yavin/yavinastronomy.htm   (1481 words)

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