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Hipparchus satellite

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


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    [hur-soo-chuh-luh s] /hɜrˈsu tʃə ləs/ adjective 1. .

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    Health Information Research Unit

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