The apparent angular displacement of the position of a celestial body in the direction of motion of the observer. This effect is caused by the combination of the velocity of the observer and the velocity of light. An observer on Earth would have Earth’s orbital velocity around the sun (VEarth), which is approximately 30 km/s. As a result of this effect in the course of a year, the light from a fixed star appears to move in a small ellipse around its mean position on the celestial sphere. The British astronomer JAMES BRADLEY (1693–1762) discovered this phenomenon in 1728.
Senin, 03 November 2008
aberration of starlight
The apparent angular displacement of the position of a celestial body in the direction of motion of the observer. This effect is caused by the combination of the velocity of the observer and the velocity of light. An observer on Earth would have Earth’s orbital velocity around the sun (VEarth), which is approximately 30 km/s. As a result of this effect in the course of a year, the light from a fixed star appears to move in a small ellipse around its mean position on the celestial sphere. The British astronomer JAMES BRADLEY (1693–1762) discovered this phenomenon in 1728.
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