Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • Bessel, Friedrich Wilhelm 1784-1846. Prussian astronomer who recalculated the orbit of Halley's comet (1804), verified by parallax the distance from Earth to the twin star 61 Cygni (1838), and developed a class of mathematical functions based on his study of planetary perturbation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. German mathematician and astronomer who made accurate measurements of stellar distances and who predicted the existence on an 8th planet (1784-1846)

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