SETI bioastro: Friedrich Wilhelm Bessel

From: LARRY KLAES (ljk4_at_msn.com)
Date: Sat Jul 22 2006 - 23:34:09 PDT

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    Friedrich Wilhelm Bessel

    Born this day (July 22) in 1784, German astronomer Friedrich Wilhelm Bessel
    made the first measurement of the distance of a star other than the Sun, and
    his work allowed the first accurate determination of interstellar distances.

    Bessel also:

    "As well as helping determine the parallax of 61 Cygni, Bessel's precise
    measurements allowed him to notice deviations in the motions of Sirius and
    Procyon, which he deduced must be caused by the gravitational attraction of
    unseen companions. His announcement of Sirius' "dark companion" in 1844 was
    the first correct claim of a previously unobserved companion by positional
    measurement, and eventually led to the discovery of Sirius B."

    http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Bessel.html

    http://en.wikipedia.org/wiki/Bessel


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