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Topic: Celestial sphere

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  NationMaster - Encyclopedia: Celestial sphere   (Site not responding. Last check: 2007-10-21)
The celestial sphere is divided by the celestial equator.
CELESTIAL SPHERE: The night sky looks like an upside down bowl set on the horizon, but as it turns around during the night it is easy to think of it as a giant sphere with the stars lying on the inside surface.
Celestial sphere - The imaginary sphere whose center is the center of the Earth and on which the fixed stars, planets, Sun, Moon, and the zodiac are located.
www.nationmaster.com /encyclopedia/Celestial-sphere   (1679 words)

 * Celestial sphere - (Astrology): Definition   (Site not responding. Last check: 2007-10-21)
Hemisphere: is an equal half of the Celestial Sphere from 0º of Aries, to 0º of Libra.
The Tropic of Cancer is a circle on the celestial sphere, as well as on the surface of the Earth, parallel to and at an angular distance of 23 degrees and 27 minutes from the equator.
Celestial Equator The projection onto the Celestial Sphere of the Earth's equator in the same plane as the Earth's equator, in other words, the projection of the Earth's equator onto the sky.
en.mimi.hu /astrology/celestial_sphere.html   (604 words)

 The Celestial Sphere
The concept of the celestial sphere was fundamental to positional astronomy throughout Antiquity, the Middle Ages, and the Early-Modern era, and still remains useful today.
The axis of rotation terminates in the north and south celestial poles; equidistant between the poles, the sphere is encircled by the celestial equator.
Celestial longitude is the angular distance along the ecliptic, again from the vernal equinox; celestial latitude is the distance north or south of the ecliptic along a great circle passing through the two celestial poles.
www.hps.cam.ac.uk /starry/armillmaths.html   (710 words)

 Astronomy - MSN Encarta
Another important part of the celestial sphere is the line that marks the movement of the Sun with respect to the stars throughout the year.
The ecliptic is tilted 23.5° to the celestial equator and crosses the celestial equator at two points on opposite sides of the celestial sphere.
The celestial equator is at declination 0°, the north celestial pole is at declination 90°, and the south celestial pole has a declination of –90°.
encarta.msn.com /encyclopedia_1741502444_5/Astronomy.html   (1310 words)

 celestial sphere
The imaginary sphere upon whose inner surface celestial objects can be considered to lie for the purpose of describing their position; it is centered on the origin of whatever system of celestial coordinates is being used.
The celestial equator is the great circle on the celestial sphere that divides the northern and southern hemispheres and serves as the zero-mark for declination; it is the projection into space of Earth’s equatorial plane.
The celestial latitude is the angular distance on the celestial sphere measured north or south of the ecliptic along the great circle passing through the poles of the ecliptic and the celestial object.
www.daviddarling.info /encyclopedia/C/celsphere.html   (274 words)

 Orbits and the Ecliptic Plane
Celestial measurement is taken to mean the kinds of measurement with respect to the celestial sphere which allow you to locate astronomical objects for observation.
Measurements with respect to the celestial sphere are typically expressed as right ascension and declination, measurements analogous to latitude and longitude on the Earth's surface.
The ecliptic plane is inclined at 23.5° with respect to the celestial equator because of the tilt of the Earth's rotation axis with respect to the plane of its orbit around the sun.
hyperphysics.phy-astr.gsu.edu /hbase/eclip.html   (870 words)

 Celestial Sphere   (Site not responding. Last check: 2007-10-21)
The poles of the celestial sphere are aligned with the poles of the Earth.
Analogous to the latitude on Earth, the Declination of an object on the celestial sphere is measured northward or southward from the plane containing the equator.
The declination of the equator is 0 degrees, the North Celestial Pole, +90 degrees, the South Celestial Pole, -90 degrees.
astrosun.tn.cornell.edu /courses/astro201/cel_sphere.htm   (416 words)

 Highbeam Encyclopedia - Search Results for celestial sphere   (Site not responding. Last check: 2007-10-21)
It is the great circle on the celestial sphere midway between the observer's zenith and nadir; it divides the celestial sphere into two equal hemispheres.
The celestial pole is important as a reference point in the equatorial coordinate system ; the celestial meridian passes through it, as do the hour circles of the stars.
The celestial sphere is an imaginary sphere with the observer at its center.
www.encyclopedia.com /articles/52531.html   (642 words)

 celestial sphere - Hutchinson encyclopedia article about celestial sphere   (Site not responding. Last check: 2007-10-21)
The positions of bodies such as stars, planets, and galaxies are specified by their coordinates on the celestial sphere.
The equivalents of latitude and longitude on the celestial sphere are called declination and right ascension (which is measured in hours from 0 to 24).
The celestial sphere appears to rotate once around the Earth each day, actually a result of the rotation of the Earth on its axis.
encyclopedia.farlex.com /celestial%20sphere   (225 words)

 Glossary I: The Celestial Sphere
It appears that the daily motion is due to the rotation of the celestial sphere.
This is an older term used to distinguish stars which remain at fixed positions on the celestial sphere, as opposed to the "wandering stars", planets, which move around the celestial sphere.
The nodes are the points where the path of the moon on the celestial sphere crosses the ecliptic.
www.cerritos.edu /ladkins/a106/glossary_celestialsphere.htm   (1063 words)

 The Celestial Sphere
This sphere is known as the celestial sphere.
The celestial equator corresponds to the projection of the earth's equator onto the celestial sphere.
One is the alteration of the position of the vernal equinox on the celestial sphere, and therefore the alteration in the right ascension of all astronomical objects.
wind.cc.whecn.edu /~marquard/astronomy/celestial_sphere.htm   (981 words)

 Celestial sphere   (Site not responding. Last check: 2007-10-21)
In astronomy and navigation the celestial sphere is an imaginary rotating sphere of "gigantic radius " concentric with the Earth.
This divides the sphere the north celestial hemisphere and the south hemisphere.
Celestial Treasury: From The Music Of The Spheres To The Conquest Of Space is an impressive coffee-table book surveying the history of man's exploration of the stars.
www.freeglossary.com /Celestial_sphere   (606 words)

 Celestial Sphere
In between is the great circle of the horizon, which is the circle on the celestial sphere cut by a plane tangent to the Earth at your feet.
The celestial sphere is tipped relative to the observer in the same way as is the Earth.
The perpendicular angle of a star north or south of the celestial equator is given by its declination, indicated by lower case Greek letter Delta.
www.astro.uiuc.edu /~kaler/celsph.html   (1937 words)

 The Celestial Sphere
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.
Actually, all objects are slowly changing their relative positions on the celestial sphere, but for most the motion is so slow that it cannot be detected over timespans comparable to a human lifetime; only the "wanderers" have sufficiently fast motion for this change to be easily visible.
Another important imaginary object on the celestial sphere is the "ecliptic" or "Road of the Sun", which is the imaginary path that the Sun follows on the celestial sphere over the course of a year.
csep10.phys.utk.edu /astr161/lect/celestial/celestial.html   (824 words)

 celestial sphere - HighBeam Encyclopedia
CELESTIAL SPHERE [celestial sphere] imaginary sphere of infinite radius with the earth at its center.
In astronomical coordinate systems, the coordinate axes are great circles on the celestial sphere.
In most systems of this type, the reference points are fixed on the sphere, so the two coordinates needed to locate a body are relatively constant.
www.encyclopedia.com /html/c1/celest-sph.asp   (233 words)

 Astronomy Without a Telescope
The Earth's axis of rotation intersects the celestial sphere at the celestial poles.
The number of degrees the celestial pole is above the horizon is equal to the latitude of the observer.
Celestial objects on the celestial equator are up 12 hours and those south of the celestial equator are above the horizon for less than 12 hours because you see less than half of their total 24-hour path around you.
www.astronomynotes.com /nakedeye/s4.htm   (1466 words)

 Celestial Sphere
Declination is the equivalent of latitude measured in degrees from the celestial equator (0 to 90).
The zero point chosen on the celestial sphere is the first point of Aries, γ, and the angle between it and the intersection of the meridian through a celestial object and the celestial equator is called the right ascension (RA) of the object.
Constellations are often drawn in the shapes of mythical heros and creatures tracing a pattern of stars on the celestial sphere, recorded on a star map.
zebu.uoregon.edu /~js/ast122/lectures/lec02.html   (2041 words)

 The Celestial Sphere   (Site not responding. Last check: 2007-10-21)
Like the Earth, the celestial sphere has a celestial equator and north and south celestial Poles, or NCP and SCP, repectively, which are just the projections of these points on Earth onto the sky.
You can't see the entire celestial sphere in 24 hours, but the entire celestial sphere is visible over a year, as the Earth revolves around the Sun.
The north celestial pole is the projection of the Earth’s north pole onto the Celestial Sphere.
www.astro.lsa.umich.edu /Course/Labs/celsphere/celestial-sphere-v2.html   (1662 words)

 Navigator Light Software
The declination is measured in the plane North-South, from the Celestial Equator.
The celestial sphere poles, being in the axis of rotation, remain fixed in the sky.
Because both Earth and Celestial equators are in the same plane, the latitude of the GP is equal to the declination of the star.
www.tecepe.com.br /nav/inav_c11.htm   (1545 words)

 Celestial Sphere United Nations, Geneva
The Celestial Sphere is the symbol of hope for the global community for a peaceful world under international law, set by the UN and underwritten by its Member States, including Switzerland.
As such the Celestial Sphere is in addition the symbol of the UN Headquarters in Europe, the largest and most active office of the UN worldwide, as well as the centre of the world's largest conglomerate of UN-related organisations, including among others WHO, WTO and UNHCR.
The motor that caused the sphere to rotate slowly ceased to function in the early 1960's and was not used at all during 1940-1945.
www.celestialsphere.ch   (872 words)

 The Celestial Sphere--lesson plan #1a
Celestial sphere, constellation, zodiac, celestial pole, the Pole Star ("Polaris"), celestial equator, rotation of the Earth, planets [theodolite, equatorial axis].
When we view the stars at night, it seems as if we are at the center of a huge sphere and the stars are points of light distributed across it.
That is "the celestial sphere." In ancient times people believed such a sphere actually existed and was rotating around us.
www-spof.gsfc.nasa.gov /stargaze/Lcelsph.htm   (1079 words)

 Celestial Sphere Applet
As the Earth rotates on its axis, the Celestial Sphere remains stationary.
Therefore, on the Earth it appears as though the stars are "fixed" on the Celestial Sphere.
The planets, Moon, and Sun are all located along the ecliptic; however, their positions are not fixed on the celestial sphere.
www.ioncmaste.ca /homepage/resources/web_resources/CSA_Astro9/files/multimedia/unit1/celestial_sphere/celestial_sphere.html   (124 words)

 Photography techniques: Angles and the celestial sphere - an introduction
The celestial sphere is an imaginary sphere with unspecified radius, centered on the observer (you).
The rainbow is seen in a certain direction on the sphere, which only depends on your position and the position of the sun in the sky.
The celestial sphere as used frequently in atmospheric optics to describe the directions of light sources, halos and other phenomena.
www.weather-photography.com /techniques.php?cat=optics&page=celestialsphere   (1133 words)

 The Celestial Sphere   (Site not responding. Last check: 2007-10-21)
During the night we see the stars affixed to this sphere slowly rise in the east, travel overhead, and set in the west.
The sun's position on the celestial sphere changes during the year, which is why the sun is on a swivel arm.
Even though scientists have abandoned the Celestial Sphere theory, notwithstanding the objections of the Catholic Church, it is still convenient to use a celestial sphere as a map of where the stars and constellations are.
members.cox.net /deleyd/religion/solarmyth/csphere.html   (477 words)

 Celestial Sphere   (Site not responding. Last check: 2007-10-21)
The celestial sphere (and, therefore, the stars) appears to move westward -- stars rise in the east and set in the west.
This circular path is tilted 23.5 degrees with respect to the celestial equator because the Earth's rotation axis is tilted by 23.5 degrees with respect to its orbital plane.
The Sun crosses the celestial equator moving northward at the vernal equinox around March 21, and crosses the celestial equator moving southward at the autumnal equinox around September 22.
www.star.ucl.ac.uk /%7Eidh/STROBEL/nakedeye/nakedeya.htm   (3655 words)

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