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Hipparchus satellite |
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Hipparchus satellite [hɪˈpɑːkəs]
n (Astronomy) an astronometric satellite launched in 1989 by the European Space Agency that measured the position, proper motion, and brightness of 118 218 stars down to 12th magnitude and the magnitude and colour of a million stars down to 10th magnitude [after Hipparchus, Greek astronomer (2nd century bc] Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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