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Celestial sphere - Wikipedia, the free encyclopedia In astronomy and navigation, the celestial sphere is an imaginary rotating sphere of "gigantic radius", concentric with the Earth. Projected, from their corresponding terrain equivalents, are the celestial equator and the celestial poles. As the earth rotates from west to east, the celestial sphere appears to rotate from east to west. en.wikipedia.org /wiki/Celestial_sphere   (385 words)

SailNet Articles   (Site not responding. Last check: 2007-08-09) At sea, the celestial horizon is parallel to the observer's horizon, or the visible horizon from your eye to where the sky meets the ocean. The visible horizon is separated from the celestial horizon by the radius of the earth and the two are parallel. A celestial LOP is actually a circle on the earth's surface plotted from the body's subpoint with a radius equal to the distance from the observer to that subpoint. www.sailnet.com /collections/articles/index.cfm?articleid=sexton0072   (1872 words)

Introduction to Spherical Astronomy: p. 17 At the north pole (latitude=+90°), the north celestial pole (NCP) is at zenith and the celestial equator lies on the horizon. At the equator (latitude=0°), the north celestial pole (NCP) is on the northern horizon and the south celestial pole (SCP) is on the southern horizon. At the south pole (latitude=-90°), the south celestial pole (SCP) is at zenith and the celestial equator lies on the horizon. www.physics.csbsju.edu /astro/CS/CS.16.html   (908 words)

AllRefer.com - celestial horizon (Astronomy, General) - Encyclopedia celestial horizon, one axis of the altazimuth coordinate system. 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 observer may be unable to see all the stars that lie above his celestial horizon because of obstructions such as buildings, trees, or mountains; he may be able to see some stars that lie below his celestial horizon because of atmospheric refraction. reference.allrefer.com /encyclopedia/C/celest-hor.html   (196 words)

Astronomy Without a Telescope 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. Altitude of celestial equator on meridian = 90 - observer's latitude. www.astronomynotes.com /nakedeye/s4.htm   (1466 words)

Celestial Navigation Celestial Navigation is the art and science of using celestial bodies such as the Sun, Moon, planets and stars to determine an observer's position on Earth. If we have a celestial body (denoted by the yellow star in Figure 3) on the celestial sphere, then it's azimuth is the arc of the celestial horizon which lies between the observer's meridian and the vertical circle of the body. The declination of the celestial body (the body is denoted by star on Figure 4) is the arc of the body's meridian from the celestial equator to the place of the body on the sphere. www.math.ubc.ca /~cass/courses/m308-02b/projects/jackson/Page1.html   (795 words)

Astronomical Leage - Astro Note 11: Celestial Coordinate Systems Since all objects on the celestial sphere appear to be at the same, arbitrarily large distance from the observer, it is usually not necessary to know the object's true distance. Since the celestial sphere appears as a two dimensional, curved surface, two angular measurements are required to specify one object's position relative to another. That intersection where the Sun appears to cross the celestial equator from south to north is chosen as the reference point and is known as the vernal equinox. www.astroleague.org /al/astrnote/astnot11.html   (607 words)

www.TheAstrologerOnline.com The meaning of the horizon and the meridian, the sun and the moon and the planets and stars and eventually the zodiac take on a far greater significance when they are known in their primary natural state as sensible objects with specific appearances and periods. The celestial horizon is a projection of the observer's horizon onto the celestial sphere. Angular distance north or south of the ecliptic is known as celestial latitude and is measured along a meridian of celestial longitude through 90 degrees to either the north or south poles of the ecliptic. www.forumonastrology.com /articles/art-de1_right.html   (1266 words)

Celestial Sphere   (Site not responding. Last check: 2007-08-09) 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. astrosun2.astro.cornell.edu /academics/courses/astro201/cel_sphere.htm   (416 words)

AMS Glossary This type of horizon is used as the reference for establishing times of sunrise and sunset. 4) Astronomical horizon (also called sensible horizon, real horizon): the plane that passes through the observer's eye and is perpendicular to the zenith at that point; or, the intersection of that plane with the celestial sphere (i.e., a great circle on the celestial sphere equidistant from the observer's zenith and nadir). 5) Celestial horizon (also called rational horizon, geometrical horizon, true horizon): the plane, through the center of the earth, that is perpendicular to a radius of the earth that passes through the point of observation on the earth's surface; or, the intersection of that plane with the celestial sphere. amsglossary.allenpress.com /glossary/search?id=horizon1   (410 words)

Astronomical Foundations of the Astrological Houses - Advanced Astrology Articles - Understanding Astrology - ... The horizon is the most important reference level in astrology when it comes to the houses because it forms the platform on which we experience ourselves as observers of all phenomena. The intersections of the ecliptic and the horizon constitute the Ascendant and Descendant. In relation to the celestial equator, this means that the Aries and Libra points constitute the intersection points of this great circle with the ecliptic, whereas the Cancer and Capricorn points are the points with the greatest distance between ecliptic and celestial equator. www.astro.com /astrologie/cw_astro_houses_g.htm?lang=e   (2295 words)

Celestial Sphere Declination is the equivalent of latitude measured in degrees from the celestial equator (0 to 90). It is measured north and south of the celestial equator and ranges from 0° at the celestial equator to 90° at the celestial poles, being taken to be positive when north of the celestial equator and negative when south. 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. zebu.uoregon.edu /~js/ast122/lectures/lec02.html   (2041 words)

Coordinate Systems The north point is one of the two points which lies on the intersection of the celestial meridian and the horizon and is closest to the north celestial pole. A coordinate of -90 degrees declination indicates that the point is on the south celestial pole while +90 degrees indicates that it is on the north celestial pole. The horizon (sometimes called horizontal) coordinate system is easier to visualize than the equatorial coordinate system, but harder to work with because positions are measured in relation to the zenith which is always changing position. students.ee.sun.ac.za /~riaanvdd/coordinate_systems.htm   (3071 words)

Celestial Sphere   (Site not responding. Last check: 2007-08-09) 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. Objects on the celestial equator are at 0 degrees dec, objects half-way to the NCP are +45 degrees, objects at the NCP are +90 degrees, and objects at the SCP are -90 degrees. www.star.ucl.ac.uk /~idh/STROBEL/nakedeye/nakedeya.htm   (3655 words)

Voyage 4 Each celestial object lies on an hour circle and is located on the celestial sphere by the coordinates of declination and right ascension. The ecliptic is inclined to the celestial equator by a 23.5 degree angle because the Earth’s equator is tipped 23.5 degrees relative to its orbital plane (the ecliptic plane). At the North Pole (Figure 4.7) where the horizon and celestial equator are one and the same circle, the Sun circles around the horizon and never sets. www.physics.emich.edu /jwooley/chapter4/Chapter4.html   (2414 words)

The Celestial Sphere Celestial Sphere is the conventional representation of the sky as a spherical shell upon which the celestial bodies are projected. Celestial Horizon is the great circle on the celestial sphere halfway between zenith and nadir. Azimuth of an object is the angular distance measured eastward from the vertical circle passing through north, along the horizon, to the vertical circle of the object. academic.dt.uh.edu /~forrestr/c_sphr.htm   (798 words)

Coordinate conversion: celestial to horizon Azimuth is the angle of a celestial object around the sky from north. Altitude is the complement of the zenith angle, which is the angle from the local meridian to the hour circle of object being observed. The hour angle is the angle between an observer's meridian projected onto the celestial sphere and the right ascension of a celestial body. home.att.net /~srschmitt/celestial2horizon.html   (643 words)

Simplified Astronomy for Astrologers Distances north or south of the Celestial Equator are measured on the Hour Circle passing thru the heavenly body and are expressed as DECLINATION, from 0° at the celestial equator to 90° at the celestial poles. Since the celestial meridian of the observer remains stationary with respect to a place on the earth (the observer’s Longitude), while the hour circle moves with the body as it circles the earth from east to west, hour angles always increase westward. The NORTH POINT of the horizon is that point of intersection of the meridian and horizon that is nearest the north pole. lovestarz.com /astronomy.html   (3210 words)

AllRefer.com - altazimuth coordinate system (Astronomy, General) - Encyclopedia altazimuth coordinate system[altaz´umuth] Pronunciation Key or horizon coordinate system, astronomical coordinate system in which the position of a body on the celestial sphere is described relative to an observer's celestial horizon and zenith. Altitude is measured from the celestial horizon along the vertical circle through the body and the zenith of the observer. Azimuth is measured along the celestial horizon from the observer's south point (the point on the horizon directly south of him) to the point where the body's vertical circle intersects the horizon. reference.allrefer.com /encyclopedia/A/altazCoor.html   (238 words)

celestial horizon : Definition from the Online Dictionary at Datasegment.com (b) A plane parallel to the sensible horizon of a place, and passing through the earth's center; -- called also rational horizon or celestial horizon. Artificial horizon, a level mirror, as the surface of mercury in a shallow vessel, or a plane reflector adjusted to the true level artificially; -- used chiefly with the sextant for observing the double altitude of a celestial body. Dip of the horizon (Astron.), the vertical angle between the sensible horizon and a line to the visible horizon, the latter always being below the former. onlinedictionary.datasegment.com /word/celestial+horizon   (387 words)

FM 6-2 Glossary the altitude of a celestial body is the arc of its vertical circle measured from the observer's horizon to the body, or it is the vertical angle at the observer's position between the horizon and the body the horizon for any place on the surface of the earth is the great circle formed on the celestial sphere by the extension of the plane of the observer's horizon. the refraction of a celestial body is the apparent displacement of the body caused by the bending of light rays passing through layers of air of varying density. www.globalsecurity.org /military/library/policy/army/fm/6-2/Gloss.htm   (1992 words)

Positional Astronomy The Altitude of an object is measured with respect to the Celestial Horizon; i.e. The altitude of the NCP is equal to the latitude of the observer. The FPA is the position of the Vernal Equinox; it is where the Ecliptic crosses the Celestial Equator. www.astunit.com /tutorials/positional.htm   (503 words)

[No title] The angular distance between the north point on the horizon eastward around the horizon to the point on the horizon nearest to the direction to a celestial body. The circle on the celestial sphere that is 90° from the zenith. The celestial horizon is approximately the boundary between the Earth and sky. highered.mcgraw-hill.com /sites/0072482621/student_view0/chapter1/glossary.html   (495 words)

chapter1   (Site not responding. Last check: 2007-08-09) On the celestial sphere, the circle which is located 90 degrees from the zenith is the horizon. The angular distance of an object from the horizon is its altitude. The azimuth and altitude of an object located due south and on the horizon are azimuth 180 degrees, altitude 0 degrees. www.csulb.edu /~htahsiri/astrouci/chapter1.html   (401 words)

Introduction to Spherical Astronomy   (Site not responding. Last check: 2007-08-09) Unless you live in Kansas, real horizons are partially obstructed, but we can imagine what the view would look like without the bell banner, etc. getting in the way. The horizon would then be a 360° circle where sky meets ground. The yellow star, on the other hand, I mean to be on the front side of the dome, and hence a bit above the NW horizon as viewed by the stick figure. www.physics.csbsju.edu /astro/CS/CSintro.html   (270 words)

Celestial Sphere · Astrological definition of Celestial Sphere · Astrology Encyclopedia Parallel to the Horizon are Parallels of altitude. With your celestial sphere marked off on this system, it can be seen that the Sun does not travel around this Celestial equator; but instead, its orbit is inclined to that of the Equator some 23.5 degrees. The horizon system appears to yield the correct House positions of the planets in a birth map, but the directing (q.v.) of planets to the positions they will occupy at some future moment, requires the application of Oblique Ascension, both to the planets' places and to the progressed cusps. www.astrologyweekly.com /dictionary/celestial-sphere.php   (1397 words)

Definition of Celestial Horizon from dictionary.net The circle which bounds that part of the earth's surface visible to a spectator from a given point; the apparent junction of the earth and sky. (b) A plane parallel to the sensible horizon of a place, and passing through the earth's center; -- called also rational or celestial horizon. The strata all over the earth, which were formed at the same time, are said to belong to the same geological horizon. www.dictionary.net /celestial+horizon   (294 words)

Our view of the sky : Planet Earth : GCSE Astronomy : E-learning : Learning : National Maritime Museum   (Site not responding. Last check: 2007-08-09) The celestial meridian is the circle running through the zenith and the due north and due south points on the horizon. The azimuth of a star is measured as a direction around the horizon, where 0° is due north, 90° is due east, 180° is due south and 270° is due west. The north and south celestial poles (NCP and SCP) lie above the north and south poles of the Earth, whilst the celestial equator is above the equator of the Earth. www.nmm.ac.uk /server?show=conWebDoc.5462&setPaginate=No&outputFormat=print   (1582 words)

Download and License the Celestial Horizons Basic Compiler - Flash Limited Edition for the Mark III Robot Kit Celestial Horizons has made this compiler available to the Portland Area Robotics Society at a very low cost in order to promote robotics, especially through workshops and school projects. Additional information is available from Celestial Horizons' Documentation and Example Code page and includes tutorials, a list of commands and the Flash Basic FAQ. Celestial Horizons has made an arrangement with the Portland Area Robotics Society to license a special edition of the v. www.junun.org /MarkIII/CHBasic.jsp   (1074 words)

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