Coronagraph meaning

kə-rō'nə-grăf'
A telescope or an attachment for a telescope equipped with a disk that blacks out most of the sun, used to photograph the sun's corona.
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(astronomy) A telescope that has an attachment which blocks out the direct light from the sun or other star, allowing examination of the corona and the detection of exoplanets.
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A telescope designed for observing the corona of the sun by means of devices that obstruct the light of the sun's disk.
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