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noun Astronomy.
an instrument for observing and photographing the sun's corona, consisting of a telescope fitted with lenses, filters, and diaphragms that simulate an eclipse.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Coronagraph
is always a great word to know.
So is absolute magnitude. Does it mean:
| the Dog Star, the brightest-appearing star in the heavens, located in the constellation Canis Major |
| the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years |
Collins
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Encyclopedia Britannica
Encyclopedia
coronagraph
telescope that blocks the light of a star inside the instrument so that objects close to the star can be observed. It was invented in 1930 by the French astronomer Bernard Lyot and was used to observe the Sun's corona and prominences.
Learn more about coronagraph with a free trial on Britannica.com.
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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