Ecliptic - Wikipedia, the free encyclopedia
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The ecliptic is the apparent path that the Sun traces out in the sky during the year, appearing to move eastwards on an imaginary spherical surface, the celestial sphere, relative to the (almost) fi...
en.wikipedia.org/wiki/Ecliptic
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Axial tilt - Wikipedia, the free encyclopedia
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In astronomy, axial tilt is the angle between an object's rotational axis and a line through the centre of the object perpendicular to its orbital plane, where the angle is measured from the perpend...
en.wikipedia.org/wiki/Axial_tilt
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assumption, that a very slow rotation of the plane of the ecliptic cannot ..... Effect of ecliptic rotation on the solution relative to the moving frame ...
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www.springerlink.com/index/T68T72311J066075.pdf
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THE ECLIPTIC ... In the example, you are at a latitude (your location along an arc from the Earth's equator to the rotation pole, given by lower case Greek letter Phi) of 45°, halfway between the Earth's equator and the north pole.
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stars.astro.illinois.edu/celsph.html
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In the Earth's frame of reference, the Sun's apparent path is called the ecliptic. 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.
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hyperphysics.phy-astr.gsu.edu/Hbase/Eclip.html
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; The ecliptic is the path that the Moon, Sun and planets take across the sky. ... The ecliptic itself moves, or rather appears to move. These are examples from the course of one night. ... These maps are for reference only. They are meant to illustrate the rotation of the ecliptic.
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www.theskytonight.com/ecliptic.htm
www.theskytonight.com/ecliptic.htm
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In this plot, the portion of orbit in blue is above and the portion in green is below the plane of the ecliptic. As noted in conjunction with Kepler's Third Law, motion of the innermost planets is much faster than that of the outermost;
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csep10.phys.utk.edu/astr161/lect/solarsys/revolution.ht...
csep10.phys.utk.edu/astr161/lect/solarsys/revolution.html
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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).
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csep10.phys.utk.edu/astr161/lect/celestial/celestial.ht...
csep10.phys.utk.edu/astr161/lect/celestial/celestial.html
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But since the creep of the Sun along the ecliptic (one rotation per year) is so much slower than the daily rotation of the whole celestial sphere (one rotation per day), the Sun is seen to move from east to west in our sky.
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www.physics.csbsju.edu/astro/CS/CS.09.html
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