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Old May 6th 2018, 01:48 PM   #1
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Bradley stellar aberation

In 1728 James Bradley made another estimate by observing stellar aberration, being the apparent displacement of stars due to the motion of the Earth around the Sun. He observed a star in Draco and found that its apparent position changed throughout the year. All stellar positions are affected equally in this way. (This distinguishes stellar aberration from parallax, which is greater for nearby stars than it is for distant stars.)

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Bradley's (1729) stellar aberration is used to calculate the velocity of light but the change in the position of Bradley's star is caused by the earth's daily and yearly motions not the velocity of light since the shift in the position of Bradley's star results in the rotational shift of all the stars of the stellar universe centered around the North Star.

Do you have an argument that can justify Bradley's aberation?
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Old May 6th 2018, 04:02 PM   #2
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Originally Posted by lovebunny View Post
In 1728 James Bradley made another estimate by observing stellar aberration, being the apparent displacement of stars due to the motion of the Earth around the Sun. He observed a star in Draco and found that its apparent position changed throughout the year. All stellar positions are affected equally in this way. (This distinguishes stellar aberration from parallax, which is greater for nearby stars than it is for distant stars.)

_____________________________________________


Bradley's (1729) stellar aberration is used to calculate the velocity of light but the change in the position of Bradley's star is caused by the earth's daily and yearly motions not the velocity of light since the shift in the position of Bradley's star results in the rotational shift of all the stars of the stellar universe centered around the North Star.

Do you have an argument that can justify Bradley's aberation?
I don't know anything about the method, but a fairly easy read is here.

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