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Originally Posted by Jerry
The actual orbit can then be plotted, and compared with the predicted orbit based upon Keplar's laws. But it is never exactly where it should be, as the solar wind, the perturbations of the planets and any other gases, asteroids, comets - even magnetic field effects cause biases that lead to uncertanties that are of a much higher order than what Lunatik or I predict.
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Oh really? Obviously you didn't read the article I linked to.
Distant Halley's Comet:
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The identity of the comet is beyond doubt: the image is faintly visible on composite photos obtained during a single night, demonstrating that the direction and rate of motion of the detected object perfectly matches that predicted for Comet Halley from its well-known orbit. Moreover, the image is located within 1 arcsec from the predicted position in the sky.
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Your statement is, once again, false. Halley's Comet was, in fact, exactly where it should have been at 28.06 AU. Try again.