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Topic: Sidereal period

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	Orbital period -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		The orbital period is the time it takes a (Any of the celestial bodies (other than comets or satellites) that revolve around the sun in the solar system) planet (or another object) to make one full (The (usually elliptical) path described by one celestial body in its revolution about another) orbit.
		The sidereal period is the time that it takes the object to make one full orbit around the Sun, relative to the ((astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior) stars.
		It differs from the sidereal period because the object's (One-half the major axis of an ellipse; the distance from the center of an ellipse to one end) semimajor axis typically precesses or recesses slowly.
	www.absoluteastronomy.com /encyclopedia/o/or/orbital_period.htm (1045 words)

	Sidereal day - Wikipedia, the free encyclopedia
		An apparent sidereal day is the time it takes for the Earth to turn 360 degrees in its rotation; more precisely, is the time it takes a typical star to make two successive upper meridian transits.
		There are 366.2422 sidereal days in a tropical year, but 365.2422 solar days, resulting in a sidereal day of 86,164.091 seconds (or: 23 hours, 56 minutes, 4.091 seconds).
		A mean sidereal day is reckoned, not from the actual transit, but from the transit of the mean vernal equinox (see: mean sun).
	en.wikipedia.org /wiki/Sidereal_day (207 words)

	Meridian Magazine :: Science and Religion :: The Planets Testify of the Creator
		The sidereal period is relative to the stars, meaning the average interval between successive orbital passings of the planet near the same star.
		Astronomers tend to ignore the synodic period because it is earth-based.
		The synodic period of Mars is in a 4:3 ratio with Venus.
	www.ldsmag.com /sci_rel/040414planets.html (5463 words)

	The Columbia Encyclopedia, Sixth Edition: synodic period @ HighBeam Research (Site not responding. Last check: 2007-10-21)
		One sidereal month later it will not yet be full, since it must travel further in its orbit around the earth to reach the point of opposition, which has moved relative to the stars because of the earth's motion.
		This period, called the Metonic cycle, was discovered by the Greek astronomer Meton in 433 BC It is used in determining the date of Easter in the Gregorian calendar and was used in placing the intercalary month in the ancient Greek calendar.
		For the inferior planets the synodic period is longer than the sidereal period, but for the superior planets it is shorter; for Pluto the synodic period is slightly more than one year, while its sidereal period is nearly 250 years.
	www.highbeam.com /library/doc0.asp?DOCID=1E1:synodicp&refid=ip_encyclopedia_hf (316 words)

	The Sirius Research Group
		Although we have seen that in both scenarios (tropical vs. sidereal) the resonance of the synodic cycle and the position of the nodes still produces a match after the 243-year period, the 251-year period seems to create a problem with the "sidereal year".
		For instance, after a period of about 20,000 years or 360° revolutions of the Earth around the Sun (or 12510 synodic periods and 32510 Venus orbits) the difference is 15 days based on Earth's 360° tropical year and 156 days based on Earth's 360° sidereal year.
		If Earth's 360°-orbit period around the Sun were to consist of 365.256361 mean solar days (31,558,149.5 s) and the 360°-orbit period of Venus has 224.701 days, it would not be possible for a transit of Venus to be visible from Earth on or around the 8th of June 2004.
	siriusresearchgroup.com /articles/Nasa-Venus-Transit.shtml (2198 words)

	Rotation Period and Day Length
		As a result, the rotation period of a planet which has a retrograde rotation is a negative number, as shown in the table for the three planets which have such a rotation.
		To explain why the day length, or synodic period of rotation, is different from the sidereal period of rotation, we consider how a given place moves around a planet, and the way in which this changes its view of the sky, during one rotation period.
		For the second method, we divide the rotation period by the number of days in a year, and obtain 2 minutes 12.58 seconds as the difference between the rotation period and the length of the day, so that the day length would be 24 hours 39 minutes 35.24 seconds.
	www.cseligman.com /text/sky/rotationvsday.htm (2489 words)

	AllRefer.com - sidereal time (Astronomy, General) - Encyclopedia
		sidereal time (ST), time measured relative to the fixed stars; thus, the sidereal day is the period during which the earth completes one rotation on its axis so that some chosen star appears twice on the observer's celestial meridian.
		Because the earth moves in its orbit about the sun, the sidereal day is about 4 min shorter than the solar day (see solar time).
		The local sidereal time of an observer is equal to the hour angle of the vernal equinox.
	reference.allrefer.com /encyclopedia/S/sidrltim.html (225 words)

	The Astrophysics Spectator: Table: Characteristic of the Sun (Site not responding. Last check: 2007-10-21)
		These observed quantities along with the adopted sidereal period and the obliquity to the ecliptic are taken from Yoder (1995).
		The adopted sidereal period is an average rotation period—the rotation rate of the sun's surface is dependent on solar latitude.
		The obliquity to the ecliptic is the tilt of the Sun's rotation axis relative to the ecliptic.
	www.astrophysicsspectator.com /background/table/solar/Sun.html (531 words)

	Eclipses
		This period of time is equivalent to 3.8 years and represents an eclipse cycle which does not necessarily result in the repetition of similar eclipses.
		The Anomalistic month is longer than the sidereal month: Since the line of apsides makes one complete revolution in a period of 8.85 years, the perigee and apogee positions are continuously changing their direction in the sky.
		The result is the saros, a period of 18 years, 10 or 11 days (depending upon the number of leap years during that period) in which an eclipse with similar circumstances will repeat itself.
	www.astronomy.org /astronomy-survival/eclipse.html (1238 words)

	The Evening and Morning Star (Site not responding. Last check: 2007-10-21)
		The sidereal period of a planet is what is normally called simply the "orbital period." It means the period of the planet orbiting the sun as seen relative to the stars, and it is the period listed in most tables of planetary data as orbital period.
		The synodic period of a planet is the period relative to the sun as seen from the moving earth, and is by far more important than the sidereal period for the evening and morning stars because they are always near the sun.
		The periods as evening and morning star each average about 263 days, the disappearance on the near side of the sun is about 8 days, and on the far side is about 50 days, for a total of 584 days for the entire cycle.
	www.johnpratt.com /items/astronomy/eve_morn.html (1503 words)

	Astronomy Course Notes
		Specifically, the square of a planet's period is equal to the cube of its semi-major axis, if the units are relative to those of the Earth.
		The sidereal period is the time required for a planet to make one complete orbit of 360° around the Sun.
		where P(outer) represents the sidereal period of the outer planet, P(inner) represents the period of the inner planet, and T(synodic) is the synodic period of the two with respect to the Sun.
	astro.wsu.edu /allen/courses/notes/orbits.html (1060 words)

	What is the orbital period of the Moon?
		The sidereal period is the time required for a celestial body within our solar system to complete one revolution with respect to the fixed starsi.e., as observed from some fixed point outside the system.
		The sidereal period of the Moon is the time needed for it to return to the same position against the background of stars.
		The synodic period is the time required for a body within the solar system, such as a planet, the Moon, or an artificial Earth satellite, to return to the same or approximately the same position relative to the Sun as seen by an observer on the Earth.
	starchild.gsfc.nasa.gov /docs/StarChild/questions/question32.html (520 words)

	The Motion of Venus 2004 -- Analysis (Site not responding. Last check: 2007-10-21)
		The sidereal period of the planet, is the time it takes for the planet to complete one revolution around the sun, irrespective of the position of the Earth, The Earth's sidereal period is 365.25.
		The sidereal period of Venus can be found by dividing its synodic period by the amount of revolutions Venus has made around the sun.
		This causes the period of the graph to not correspond exactly to the synodic period of Venus, which is actually 583.92 days.
	www.swiftscreeksc.vic.edu.au /science/venus/analysis (257 words)

	Some Notes About the Solar System at MROB (Site not responding. Last check: 2007-10-21)
		The sidereal period of a planet is the amount of time it takes for the planet to complete one orbit, when viewed in relation to the stars.
		The sidereal periods of each planet vary from one orbit to the next, due to the gravitational influence of the other planets.
		It became clear that the period of rotation of the Earth had a significant unpredictable component — it was generally slowing from one year to the next, but not at a steady rate and with no pattern.
	home.earthlink.net /~mrob/pub/planets.html (1706 words)

	[No title]
		As discussed in class, the day is defined by the time period for the Sun to return to the same position in the sky.
		This is actually the “synodic” period, in that it is measured by an observer on the Earth, which is also moving in its orbit about the Sun at the same time.
		This is your measured sidereal period for the rotation of the Earth.
	www.mindspring.com /~jeff.wilson/docs/LABEarthRotation.doc (451 words)

	Sidereal Period of the moon
		The amount of time it takes the moon to orbit the Earth and appear at the same place on the Celestial Sphere is called the sidereal period of the moon.
		From A around the moon's orbit to B is the sidereal period (think with respect to the stars), while from A all the way to C is the synodic period.
		We intend to measure the sidereal period of the moon by noting how the moon moves with respect to a nearby star.
	www.physics.sfasu.edu /markworth/Moon_Obs.htm (592 words)

	Hindu Cosmological Time Cycles (Site not responding. Last check: 2007-10-21)
		The caturyuga period is 4320000 sidereal years made up of four major subperiods (yugapadas): the krtayuga of 1728000 years, the tretayuga of 1296000 years, the dvaparayuga of 864000 years, and the kaliyuga of 432000 years.
		The kalpa period is 4320000000 sidereal years made up of 1000 caturyugas of 4320000 years or 10000 kaliyugas of 432000 years.
		Henceforth, therefore, we shall consider the initial point of the sidereal sphere for Hindu cosmological time cycles to be the sidereal position of the mean Sun at the mean summer solstice of the year 0.8(180000) = 144000 sidereal years or 365.2563795 144000 · ----------- = 144005.6 tropical years 365.2421756 before the kaliyuga epoch.
	www.webspace4me.net /~blhill/pages.aux/astrology/hindu.cycles.html (5808 words)

	Determining the Rotation Period
		The period you have found is the synodic period, the apparent rotation period of the Sun as seen from the Earth.
		The rotation period of the Sun as seen from a fixed point in space such as a star is called the sidereal period.
		The sidereal period is shorter than the synodic period.
	www.astro.virginia.edu /~teacha/130_manual/node95.html (838 words)

	vik dhillon: phy105 - celestial mechanics - kepler's third law
		The squares of the sidereal periods of the planets are proportional to the cubes of the semi-major axes of their orbits.
		We have seen that the semi-major axis of a planet is equal to the mean distance of the planet, so an alternative form of Kepler's third law is that the cube of the mean distance of a planet is proportional to the square of its sidereal period.
		This relationship is shown in Figure 31 - a log-log plot of semi-major axis versus sidereal period for the planets of the solar system falls very close to a straight line of slope 2/3.
	www.shef.ac.uk /physics/people/vdhillon/teaching/phy105/phy105_kepler3.html (458 words)

	[No title]
		A synodic period is the time it takes for an astro-body to return to the same angular position from the Sun as seen from the Earth.
		where p_a is the sidereal period of planet a and p_b is the sidereal period of planet b.
		Now in fact the synodic period of planet b relative to planet a is the same as that of planet a relative to planet b.
	www.physics.unlv.edu /~jeffery/astro/glossary/synodic.html (776 words)

	Mystic Eye Moon Phases!
		The Moon rotates once on its axis in about the same period of time that elapses for its sidereal period of revolution, accounting for the fact that virtually the same portion of the Moon is always turned toward the Earth.
		If it does not pass through the center, the period of totality is less and may last for only an instant if the moon travels through the very edge of the umbra.
		This is the sidereal month -- the period of revolution around the earth in relation to the stars.
	www.themysticeye.com /info/moonphases.htm (3568 words)

	NASA SPACE MATHEMATICS (Site not responding. Last check: 2007-10-21)
		The period measured in this manner is called the "sidereal" period of revolution, or the period in relation to the stars.
		This period is called the "synodic" period of revolution, or the period between successive conjunctions, and it takes into account the rotation of Earth.
		In this case, the synodic period is greater than the sidereal period.
	www.jsc.nasa.gov /er/seh/math23.html (460 words)

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