In stellar aberration the position of a star when viewed with a telescope swings each side of a central position by about 20.5 seconds of arc every six months.
12.
R�mer's view that the velocity of light was finite was not fully accepted until measurements of stellar aberration were made in 1727 by James Bradley ( 1693 1762 ).
13.
Ironically, stellar aberration had first been observed by Cassini and ( independently ) by Picard in 1671, but neither astronomer was able to give an explanation for the phenomenon.
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As the astronomer John Herschel has already explained in 1844, the stellar aberration does "'not "'depend on the relative velocity of the star towards Earth.
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It seems that if the aether drag hypothesis were true then stellar aberration would not occur because the light would be travelling in the aether which would be moving along with the telescope.
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In 1725, James Bradley discovered stellar aberration, an apparent annual motion of stars around small ellipses, and attributed it to the finite speed of light and the motion of Earth in its orbit around the Sun.
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That is, movement adds only a fraction of the medium's velocity to the light ( predicted by Fresnel in order to make Snell's law work in all frames of reference, consistent with stellar aberration ).
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If we go to any file page that is linked to a Commons image, like : File : Stellar aberration . JPG for example, one of the menus on the top of the page shows " Create this page ".
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Although a ( relativistic ) velocity-addition formula can be used to explain stellar aberration, ( see Aberration of light ), another ( relativistic ) explanation using only the Lorentz transformation is also possible, as will be demonstrated.
20.
Stellar aberration could only be satisfactorily explained on the basis that the Earth is in annual orbit around the Sun, with an orbital velocity that combines with the finite speed of the light coming from an observed star or planet, to affect the apparent direction of the body observed.
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