Astron. Also erron. corona-. [f. corono-, combining form of CORONA + -GRAPH, Gr. -γραφος writing, writer.] An instrument for photographing the sun’s corona in full sunlight.
That in use is a combined form of Newtonian telescope and photographic camera, suggested by Dr. W. Huggins in a paper read before the Royal Society in 1882.
1885. Sir H. Grubb, Catal. Philos. Instr., Dr. Huggins’ Coronograph for photographing Corona.
1890. Capt. Darwin, in Phil. Trans., 306. The Coronagraph was designed as the instrument which would give the best chance of rendering it possible to obtain photographs of the corona in sunlight.
Hence Coronographic a.; also Coronogram, a photograph of the corona so obtained.
1890. Tablet, 25 Jan., 128. The special new coronagraphic instrument prepared for the occasion.
