| 1. | Thanks Andy, Stellar Parallax is the best answer I think.
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| 2. | Stellar parallax remains the standard for calibrating other measurement methods.
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| 3. | He then decided to experiment with applying photography to the determination of stellar parallax.
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| 4. | Stellar parallax remains the standard for calibrating other measurement methods ( see Cosmic distance ladder ).
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| 5. | Since stellar parallax is only detectable with telescopes, his accurate speculation was unprovable at the time.
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| 6. | Bradley's discovery of the aberration of light was made while attempting to detect stellar parallax.
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| 7. | This led to the first successful measurement of a stellar parallax, though not to the first publication thereof.
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| 8. | His early work was focused on astrometrics, particularly in the examination of photographic plates to measure stellar parallax.
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| 9. | He met with opposition from astronomers, who doubted heliocentrism because of the absence of an observed stellar parallax.
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| 10. | Based upon stellar parallax measurements by the Hipparcos spacecraft, HD 147513 lies some 42 light years from the Sun.
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मोबाइल