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Topic: Celestial equator


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In the News (Wed 22 Nov 17)

  
  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)

  
 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.
The reference point on the celestial equator is defined with the aid of another plane, the plane of the Earth's orbit, called the ecliptic.
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)

  
 Declination - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-06)
Dec is comparable to latitude, projected unto the celestial sphere, and is measured in degrees north of the celestial equator.
The declination of the sun (Sun Dec) is the angle between the rays of the sun and the plane of the earth equator.
Since the angle between the earth axis and the plane of the earth orbit is nearly constant, Sun Dec varies with the seasons and its period is one year, that is the time needed by the earth to complete its revolution around the sun.
www.bucyrus.us /project/wikipedia/index.php/Declination   (674 words)

  
 Celestial Coordinate System   (Site not responding. Last check: 2007-11-06)
In the celestial coordinate system the North and South Celestial Poles are determined by projecting the rotation axis of the Earth to intersect the celestial sphere, which in turn defines a Celestial Equator.
The zero point for celestial longitude (that is, for right ascension) is the Vernal Equinox, which is that intersection of the ecliptic and the celestial equator near where the Sun is located in the Northern Hemisphere Spring.
The point on the ecliptic where the Sun is most north of the celestial equator is termed the Summer Solstice and the point where it is most south of the celestial equator is termed the Winter Solstice.
csep10.phys.utk.edu /astr161/lect/time/coordinates.html   (700 words)

  
 PHY 445/515: Coordinate Systems   (Site not responding. Last check: 2007-11-06)
The equator (the ecliptic) is the plane of the terrestrial orbit, projected onto the celestial sphere.
The equator is the plane of the galaxy, and the origin is the center of the galaxy.
The galactic equator is inclined to the celestial equator by 62.6
www.ess.sunysb.edu /fwalter/PHY515/coords.html   (428 words)

  
 ECLIPTIC AND EQUATOR
The celestial equator is a projection of the earth's equator, and is inclined to the path of the sun (the ecliptic) by 23.5 degrees.
Celestial longitude = degrees measured along the ecliptic, starting from the March equinox (intersection of the ecliptic with the celestial equator).
Is the Sun north or south of the celestial equator...
homepage.mac.com /kvmagruder/bcp/sphere/ecliptic.htm   (354 words)

  
 Celestial Coordinates
At the Earth's equator, the Celestial Equator is directly overhead, and the poles are on opposite sides of the horizon.
As you move north, the Celestial Equator mirrors your movement, moving south the same number of degrees away from the zenith (the straight-overhead point) as you moved north of the equator.
The distance of the Celestial Equator from the zenith is equal to your latitude.
www.austin.cc.tx.us /jheath/Stellar/Hand/ccord.htm   (1105 words)

  
 Celestial Sphere   (Site not responding. Last check: 2007-11-06)
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)

  
 Celestial Coordinates   (Site not responding. Last check: 2007-11-06)
Celestial coordinates are like giving a location on Earth in latitude and longitude, except that they give location in the sky, as if you stood at the place on the Earth and looked straight up.
Just as latitude on Earth increases from 0 to 90 degrees as you move from equator to Pole, declination in the sky increases from 0 to 90 degrees as you look progressively north from the celestial equator, and from 0 to -90 degrees as you look progressively south from the celestial equator.
Celestial coordinates specify which direction something is with respect to Earth, but not the distance to the object.
cse.ssl.berkeley.edu /segwayed/lessons/findplanets/coordinates.html   (842 words)

  
 Chapter 2 Lecture Notes   (Site not responding. Last check: 2007-11-06)
Thus, on the celestial sphere, the ecliptic is tilted by the same angle relative to the celestial equator
Celestial Meridian: an imaginary line in the sky that starts on the North point on the horizon, passes straight overhead (the zenith), and ends at the South point on the horizon.
Thus, the celestial poles are not fixed- instead they follow a circular path across the celestial sphere with a period of 26,000 years.
www.gpc.edu /~jstanfor/LCTNTS2a.htm   (515 words)

  
 Astronomy Without a Telescope
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.
The arc of the celestial equator moves to the north, but the arc still intercepts the horizon at the exactly east/west points.
Altitude of celestial equator on meridian = 90 - observer's latitude.
www.astronomynotes.com /nakedeye/s4.htm   (1466 words)

  
 Schola Astronomy class 2   (Site not responding. Last check: 2007-11-06)
Celestial Coordinates -- A system of points of reference and terms which refer to them, by which we find our way around the heavens no matter where we are on earth.
Declination -- the distance of a celestial object north or south of the celestial equator, measured in degrees (the equator being 0 and the north celestial pole being 90 degrees)
Celestial longitude -- the distance east of the vernal equinox along the ecliptic, measured in degrees (0-360), minutes (60 in a degree), and seconds (60 in a minute).
www.schola-tutorials.com /astronomyscholastudy2.html   (428 words)

  
 Celestial Sphere   (Site not responding. Last check: 2007-11-06)
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.
Since the ecliptic is tilted 23.5 degrees with respect to the celestial equator, the Sun's maximum angular distance from the celestial equator is 23.5 degrees.
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)

  
 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)

  
 Astrology Celestial Equator - © Dr Shepherd Simpson
This tilts the celestial equator to an angle of 23.45º to the
This means that the Celestial Equator and the Ecliptic, as the path of the Sun have to be in alignment as well.
Celestial Equator Viewed from the Sun This would be how the Earth looked through a telescope if you were viewing it from the Sun on the day of an Equinox - if by magic you could see the plane of the Ecliptic [in yellow] and the great circle of the celestial equator [in red].
www.geocities.com /astrologyancientconcepts/celestialequator.htm   (716 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)

  
 Study quide 1 for Schola Astronomy   (Site not responding. Last check: 2007-11-06)
Summer solstice -- the point on the ecliptic at which the sun is at its furthest north from the celestial equator, marking the beginning of summer in the northern hemisphere..
Autumnal equinox -- the point on the celestial sphere at which the ecliptic recrosses the celestial equator opposite to the vernal equinox.
Winter solstice -- the point on the ecliptic at which the sun is at its furthest south from the celestial equator, marking the beginning of winter in the northern hemisphere.
www.schola-tutorials.com /Astronomyschola0304_studyguide1.html   (1120 words)

  
 Stella Online! Newsletter of the Omaha Astronomical Society   (Site not responding. Last check: 2007-11-06)
Tilted at an angle to the celestial equator would be the ecliptic, the apparent path of the Sun and most planets around the celestial sphere.
It increases from 0 degrees on the equator to 90 degrees at the poles.
The celestial equivalent of Longitude on Earth is called right ascension (abbreviated RA), and is measured not in degrees as declination is, but in units of time: hours, minutes and seconds, where 24 hours equals 360 degrees and one hour of RA equals 15 degrees of arc.
www.omahaastro.com /bcmar00.htm   (382 words)

  
 The Celestial Sphere
Celestial Sphere is the conventional representation of the sky as a spherical shell upon which the celestial bodies are projected.
Autumnal Equinox is the point on the ecliptic where the sun crosses the celestial equator at the beginning of  autumn, i.e.
Celestial Horizon is the great circle on the celestial sphere halfway between zenith and nadir.
academic.dt.uh.edu /~forrestr/c_sphr.htm   (798 words)

  
 Matrix Astrology Software : Learn Astrology - Visual Astrology - Equatorial Coordinates   (Site not responding. Last check: 2007-11-06)
The poles are at the intersection of the Earth's pole and the pole of the celestial sphere, an imaginary surface at an infinite distance with the Earth as its center.
The circle at the intersection of the plane of the Earth's equator and the celestial sphere is the Celestial Equator.
The celestial equator has as its poles the celestial poles and all points on the celestial equator are equidistant from the two poles.
www.thenewage.com /resources/vastrology/ecoord.asp?orig=   (595 words)

  
 Section 8   (Site not responding. Last check: 2007-11-06)
The farther north you are, the closer to the zenith the North Celestial Pole is.
Corollary: The farther south you are, the closer to the zenith the _________ Celestial Pole is.
It is helpful to be aware of the orientation of the Celestial Equator because all the stars move in circles parallel to the Celestial Equator.
www.elcamino.cc.ca.us /faculty/slloyd/section_8.htm   (434 words)

  
 Open Course : Astronomy : Introduction : Lecture 2 : Motion of Stars and Sun
The equator is a circle on the Earth's surface that is perpendicular to the axis and equidistant from the poles.
Circles of constant declination are all parallel to the celestial equator.
The ecliptic is tilted at an angle of 23.5° with respect to the celestial equator.
www.opencourse.info /astronomy/introduction/02.motion_stars_sun   (2368 words)

  
 PSC 153 Celestial Coordinates   (Site not responding. Last check: 2007-11-06)
North-south latitude is measured in degrees from the equator, ranging from -90 degrees at the south pole, 0 degrees at the equator, to +90 degrees at the north pole.
Orangeburg, SC is located at a latitude of 33 d 30' North of the equator and at a longitude 80 d 53' West of the Greenwich (Prime) Meridian.
Thus it is the same with the Celestial Sphere surrounds the earth, it is much easier to view it as a flat surface.
www.draco.scsu.edu /coordinates.html   (1320 words)

  
 NASS FAQ - Glossary
Equation of Time: the time difference between Local Apparent Time (apparent solar time) and mean solar time at the same location.
equator: the great circle of the Earth (or other celestial body) which is equidistant from the poles.
equator, celestial: the intersection of the extended plane of the Earth’s equator with the celestial sphere.
www.sundials.org /faq/glossary/glossary.htm   (1266 words)

  
 The Motion of the Sky at Different Latitudes
The Celestial Equator rises at the East point, at a 35 degree angle to the vertical, crosses the Meridian (the North-South line through the Zenith) 35 degrees South of the Zenith, and sets at the West point, at a 35 degree angle to the vertical.
Therefore, at the poles of the planet, the Celestial Pole is overhead; at the Equator, it is on the horizon; and at mid-latitudes, it is at an angle to the horizon.
At the Equator, the paths of the stars are vertical, and are cut exactly in half by the ‘horizon’, and since the motions of the stars are ‘uniform’, each and every star is up half the time, and down half the time.
www.cseligman.com /text/sky/motions.htm   (870 words)

  
 The Basics - the Ecliptic, the Equator and Coordinate Systems
It is a circle that bands the sphere of the Earth at it's thickest point, defining 0° of terrestrial latitude and separating the northern hemisphere from the southern hemisphere.
The Equator is perpendicular to the Earth's Axis of Rotation.
Since the Equator is a circle, it too is a plane which is perpendicular to the Axis of Rotation, and which passes through the center of the Earth.
www.astrologyclub.org /articles/ecliptic/ecliptic.htm   (2039 words)

  
 Celestial Coordinates--Astronomy for Families
The poles of the Celestial Sphere lie directly above the poles of the Earth., above the Earth's North Pole is the north pole of the Celestial Equator and above the Earth's South Pole is the south pole of the celestial equator.
In the northern hemisphere spring, this path cuts the celestial equator as the Sun moves north of it.
During the northern summer the Sun stays north of the equator (which is why it is summer), then it dips in the autumn crossing through the celestial equator again.
www.geocities.com /Heartland/Fields/8616/celestial.html   (1485 words)

  
 THE CELESTIAL EQUATOR   (Site not responding. Last check: 2007-11-06)
Just as the earth's equator divides the sphere of the earth into two hemispheres - northern and southern -, so the Celestial Equator divides the apparent sphere of the sky, the Celestial Sphere, into a Northern and a Southern Celestial Hemisphere.
In the case of the sky these are the North Celestial Pole and the South Celestial Pole.
One of the continuing themes of the observational section of ASTR 106 is that the apparent geography of the sky reflects the geography of the earth from which we observe the sky.
www.deepcreekyachtclub.com /WebPage/Celestialequator.html   (348 words)

  
 Deep Impact: Amateur Observers: Intermediate Guide   (Site not responding. Last check: 2007-11-06)
Celestial Globes are useful tools for teaching astronomy coordinate systems so they are often found in astronomy lab classes.
Declination is also measured from 0° at the celestial equator to ±90° at the celestial poles.
Visualize the earth with the celestial sphere surrounding it and the celestial equator and poles are marked.
deepimpact.umd.edu /amateur/intermediate/sec1.shtml   (821 words)

  
 The Celestial Sphere   (Site not responding. Last check: 2007-11-06)
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)

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