different between coronagraph vs coronograph

English

corona +? -graph

coronagraph (plural coronagraphs)

(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

corona +? -o- +? -graph

coronograph (plural coronographs)

(astronomy) A telescope, fitted with an attachment that blocks out direct rays from the sun, used to study and photograph the corona of the sun.
(astronomy) The attachment used in such a telescope.

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