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Topic: Diurnal motion

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Celestial sphere

Sidereal time

Positional astronomy

Mean solar time

North Pole

Star

Motion

Sidereal day

Geostationary

Geosynchronous

Geosynchronous orbit derivation

Orbit

Universal time

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Time

	Diurnal motion - Wikipedia, the free encyclopedia
		Diurnal motion is an astronomical term referring to the apparent daily motion of stars in "orbit" around the Earth, caused by the Earth's rotation around its axis.
		At the equator both celestial poles are at the horizon and motion is anti-clockwise (i.e.
		Conversely, following the diurnal motion with the camera, to eliminate it on the photograph, can best be done with an equatorial mount, which requires adjusting the right ascension only; a telescope may have a motor to do that automatically (sidereal drive).
	en.wikipedia.org /wiki/Diurnal_motion (342 words)

	Prograde and retrograde motion - Wikipedia, the free encyclopedia
		Retrograde motion is the orbital motion of a body in a direction opposite that which is normal to spatial bodies within a given system.
		The apparent motion of most bodies in the sky is from east to west.
		However it is possible to observe a body moving west to east, such as an artificial satellite or Space Shuttle that is orbiting eastward (the preferred direction, because the rotation of the Earth assists in acquiring the required orbital speed).
	en.wikipedia.org /wiki/Retrograde_orbit (799 words)

	Diurnal
		Diurnal means daily, especially pertaining to actions which are completed in 24 hours and are repeated every 24 hours.
		In meteorology this can be seen in the diurnal temperature variation.
		It also applies to the stars as in diurnal motion.
	www.ebroadcast.com.au /lookup/encyclopedia/di/Diurnal.html (77 words)

	[No title]
		The rate of diurnal motion undergoes seasonal variation because of the obliquity of the ecliptic and because of the eccentricity of the Earth's orbit.
		Direct motion: for orbital motion in the solar system, motion that is counterclockwise in the orbit as seen from the north pole of the ecliptic; for an object observed on the celestial sphere, motion that is from west to east, resulting from the relative motion of the object and the Earth.
		Retrograde motion: for orbital motion in the solar system, motion that is clockwise in the orbit as seen from the north pole of the ecliptic; for an object observed on the celestial sphere, motion that is from east to west, resulting from the relative motion of the object and the Earth.
	www.astronomy.gi /glossary.html (6449 words)

	Diurnal - Wikipedia, the free encyclopedia
		in biology, diurnal refers to animals that are active in the daytime.
		in meteorology, diurnal means daily, especially pertaining to actions which are completed in 24 hours and are repeated every 24 hours; this can be seen in the diurnal temperature variation.
		in astronomy, diurnal motion refers to the apparent motion of stars around the Earth, caused by the Earth's rotation around its axis.
	en.wikipedia.org /wiki/Diurnal (141 words)

	Diurnal motion -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		At the North Pole, north, east and west are not applicable, the motion is simply left-right, or looking vertically upward, anti-clockwise around the (The point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected) zenith.
		The daily path of an object on the (The apparent surface of the imaginary sphere on which celestial bodies appear to be projected) celestial sphere, including the possible part below the horizon, has a length proportional to the cosine of the (A polite refusal of an invitation) declination.
		Diurnal motion can be seen in time-exposure (The act of taking and printing photographs) photography.
	www.absoluteastronomy.com /encyclopedia/d/di/diurnal_motion.htm (443 words)

	Outline of Day Two Selection
		But the diurnal motion is fastest of all, being completed in one day for all the spheres, no matter what their size.
		The motion of the whole should be the same as the motion of the parts, which is to the center of the universe.
		Response to First Argument: Violent motion: The argument was that the circular motion of earth was not natural (straight down) and hence was violent and could not be eternal.
	www.anselm.edu /homepage/dbanach/h-galileo-dialogue2-outline.htm (1959 words)

	The Celestial Sphere
		The diurnal motion affects all objects in the sky and does not change their relative positions: the diurnal motion causes the sky to rotate as a whole once every 24 hours.
		Superposed on the overall diurnal motion of the sky is "intrinsic" motion that causes certain objects on the celestial sphere to change their positions with respect to the other objects on the celestial sphere.
		Because the rotation axis of the Earth is tilted by 23.5 degrees with respect to the plane of its orbital motion (which is also called the ecliptic), the path of the Sun on the celestial sphere is a circle tilted by 23.5 degrees with respect to the celestial equator (see diagram at right).
	csep10.phys.utk.edu /astr161/lect/celestial/celestial.html (824 words)

	Voyage 2
		The daily east to west motion of celestial objects is caused by the Earth’s rotation and is known as diurnal motion.
		Diurnal motion causes the position of objects to change throughout the day.
		It is important to realize that because all diurnal circles are parallel to the celestial equator objects that rise at the east point must set at the west point.
	www.physics.emich.edu /jwooley/chapter2/Chapter2.html (1681 words)

	diurnal
		Diurnal motion is the apparent daily motion of celestial bodies across the sky from east to west, including the rising and setting of the Sun, caused by Earth’s rotation.
		A diurnal circle is the apparent curving track of a celestial object relative to the horizon.
		For diurnal aberration see aberration of starlight, for diurnal libration see libration, and for diurnal parallax see geocentric parallax.
	www.daviddarling.info /encyclopedia/D/diurnal.html (154 words)

	The Sun’s Apparent Diurnal Motion (Site not responding. Last check: 2007-10-21)
		The observer on earth shares this motion and sees the objects in the heavens cross the sky from east to west.
		On the eastern horizon at dawn, the sun climbs to it’s highest altitude by midday and reaches the western horizon at dusk.
		In the northern hemisphere the diurnal arc (daily path) of the sun is to the south; in the southern hemisphere the sun will be north at midday.
	www.stargazing.net /mas/bill2.htm (230 words)

	Sky Motions
		There is a clock calendar in the sky, the diurnal motion and the annual motion, the diurnal is the daily motion, brings the sun from the east to west and the stars rising in the east and setting in the west.
		Diurnal and annual motion compete against each other-- Diurnal motion carries sky east to west during the day and the annual motion carries the sun eastward in the sky over the course of an entire year.
		Daily motion due to rotation of the earth, width of time zones about 15 minutes about 15 minute per hour, or 360 degrees in 24 hours.
	www.physics.sfasu.edu /markworth/notes/Skymotionnotes.htm (651 words)

	PROOFS
		Hence we may conclude, that the matter of each planet is homogeneous, because the diurnal motion of each is uniformly performed in the same time; and this circumstance is an additional proof, that portions of different densities were originally separated from the sun.
		It is easy to perceive that the portions we mean are the satellites: Thus the formation, position, and motion of the satellites correspond, in the most perfect manner, with our theory; for they all move in the same direction, and in concentric circles round their principal planets, and nearly in the plane of their orbits.
		But, it may be said, that, though the earth were composed of concentric beds, of different densities, the equality of its diurnal motion, and the uniform inclination of its axis, would remain equally undisturbed, as upon the supposition of its consisting wholly of homogeneous matter.
	faculty.njcu.edu /fmoran/vol1art2.htm (5841 words)

	The celestial sphere (Site not responding. Last check: 2007-10-21)
		This apparent motion is a consequence of the earth's rotating once on its axis with respect to the reference frame of the stars each day.
		This apparent motion is a consequence of the earth's revolution about the sun with respect to the reference frame of the stars each year.
		The ecliptic is tilted by 23.5 degrees to the celestial equator because of the tilt of the earth's spin axis with respect to its orbital axis.
	www.calvin.edu /academic/phys/planetarium/planet04.html (339 words)

	Daily Motions
		The daily (diurnal) motion of the celestial objects is caused by the rotation of the Earth on its axis.
		The diurnal circles are parallel to the horizon.
		The diurnal circles are roughly perpendicular to the horizon near the east and west points on the horizon.
	zebu.uoregon.edu /~imamura/121/lecture-2/daily.html (863 words)

	Diurnal motion
		Diurnal motion is an astronomical term referring to the apparent daily motion of stars in "orbit" around the Earth.
		Such motion can be shown by time-exposure[?] photography.
		Some of the more circumpolar stars may appear to be motionless.
	www.ebroadcast.com.au /lookup/encyclopedia/di/Diurnal_motion.html (72 words)

	Important Points (Site not responding. Last check: 2007-10-21)
		Apparent motions in the sky are caused by motions of the Earth.
		Diurnal (daily) motion is caused by the earth's rotation.
		The seasonal westward motion of the constellations is caused by the earth's orbital motion around the sun.
	www.astro.utoronto.ca /~zhu/ast101/note1.html (303 words)

	The Celestial Sphere (Site not responding. Last check: 2007-10-21)
		This motion is due to the rotation of the Earth.
		However, the orbital motion of the Earth, caused by the Earth's revolving around the sun causes the Sun to move eastward along the ecliptic from one day the next, the opposite of it's daily motion.
		Describe the motion of the sun at the north pole.
	www.astro.lsa.umich.edu /users/rstanek/s03/celestial-sphere-v3.html (745 words)

	chapter2
		The diurnal circles growsmaller for stars that are nearer the north celestial pole.
		The variable rate of the Sun's motion on the ecliptic causes changes in the length of the solar day throughout the year.
		The motions of the planets among the stars are quite complex.
	www.csulb.edu /~htahsiri/astrouci/chapter2.html (503 words)

	ASTR 121, O'CONNELL. Study Guide
		Cyclical motions of bright objects in sky were the main historical stimulus for the study of astronomy.
		Motions are with respect to the stars, except for the diurnal* motion, which is with respect to the local horizon.
		The apparent eastward motion means that the Earth must spin a little more than once on its axis to bring the sun back to the point of local "noon" (i.e.
	www.astro.virginia.edu /class/oconnell/astr121/121f98/guide3-f98.html (781 words)

	observing log (Site not responding. Last check: 2007-10-21)
		Summarize your observations: State the direction of night-to-night motion (use compass directions) of the moon in the sky, and its angular rate (on the average) of motion per day.
		Summarize (paragraph) the diurnal motion of the star groups that you observed.
		By the end of the month you should notice that the position of a star at 10:00, for example, is significantly shifted from where it appeared at the beginning of the month at the same time.
	www.gardner-webb.edu /GWU/NaturalSci/physics/phy104/log.htm (1827 words)

	The Celestial Sphere (Site not responding. Last check: 2007-10-21)
		diurnal motion of the heavens is an effect of the earth's rotation on its axis from west to east, within the celestial sphere.
		The motion of stars rising in the east is fastest - stellar motions become progressively slower as the rising is farther from the east point.
		RA and declination, but also what time it is, because of the diurnal motion.
	academic.dt.uh.edu /~forrestr/c_sphr.htm (798 words)

	JAS: Astronomical Glossary (Site not responding. Last check: 2007-10-21)
		Eccentric anomaly: in undisturbed elliptic motion, the angle measured at the center of the ellipse from pericenter to the point on the circumscribing auxiliary circle from which a perpendicular to the major axis would intersect the orbiting body.
		Thus the mean anomaly is the angle from pericenter of a hypothetical body moving with a constant angular speed that is equal to the mean motion.
		Sidereal time: the measure of time defined by the apparent diurnal motion of the catalog equinox; hence a measure of the rotation of the Earth with respect to the stars rather than the Sun.
	www.jas.org.jo /glos.html (6496 words)

	Chapter Disvalue <i>to</i> Dive of D by Webster's Dictionary (1913 Edition)
		Relating to the daytime; belonging to the period of daylight, distinguished from the night; — opposed to nocturnal; as, diurnal heat; diurnal hours.
		the aberration of light arising from the effect of the earth's rotation upon the apparent direction of motion of light.
		the motion of the earth upon its axis which is described in twenty-four hours.
	www.bibliomania.com /2/3/257/1195/22434/4.html (306 words)

	International Catholic University: 29.2 (Site not responding. Last check: 2007-10-21)
		The motions of the stars and the planets were studied by the astronomers and Ptolemy was able to describe them quite accurately by compounding circular motions in the form of cycles and epicycles.
		On the earth, natural motion is linear: the falling of earth and water and the rising of air and fire.
		He rejected the theory of antiperistasis, attributed to Plato, that explained the continuing motion of a projectile after it has left the hand of the thrower by assuming that the medium in which the motion takes place is moved by the front of the projectile and comes round to the back and pushes it along.
	icu.catholicity.com /c02902.htm (4892 words)

	Nicole Oresme - On the Heavens
		For this [reasoning] is evident the response to the first experience, since one could say that the sun and the stars appear thus to set and rise and the heavens to turn as the result of the movement of earth and its elements where we are situated.
		To the second experience, according to this opinion, the response is [this]: Not only is the earth so moved [diurnally], but with it water and the air, as was said, in such a way that the water and lower air are moved differently than they are by winds and other causes.
		But if it is so that the heavens are moved with a diurnal movement, it becomes necessary to posit in the principal bodies of the world and in the heavens two contrary kinds of movement, one east-to-west, and others of the opposite kind, as has been said often.
	web.clas.ufl.edu /users/rhatch/pages/02-TeachingResources/HIS-SCI-STUDY-GUIDE/0040_nicoleOresme.html (2225 words)

	Astronomy Without a Telescope
		Be sure to keep distinct in your mind the difference between the slow drift of the Sun along the ecliptic during the year and the fast motion of the rising and setting Sun during a day.
		Since a celestial object's diurnal path is parallel to the celestial equator, stars do not rise or set at the geographic poles.
		The Sun reaches winter solstice around December 21 and you see the least part of its diurnal path all year---this is the day of the least amount of daylight and marks the beginning of the season of winter for the northern hemisphere.
	www.astronomynotes.com /nakedeye/s5.htm (1280 words)

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