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adjective Astronomy.
pertaining to or occurring near the sun, especially applied to such risings and settings of a star as are most nearly coincident with those of the sun while yet visible.
Dictionary.com Unabridged
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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Link To heliacal
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Heliacal
is always a great word to know.
So is red giant. Does it mean:
| the partial or imperfect shadow outside the complete shadow of an opaque body, such as a planet, where the light from the source of illumination is only partly cut off |
| a star in an intermediate stage of evolution, characterized by a large volume, low surface temperature, and reddish hue |
Etymonline
Word Origin & History
heliacal
"pertaining to the sun," 1607, from Gk. heliakos "of the sun," from helios "sun" (see sol). The heliacal year is reckoned from the heliacal rising of Sirius; it is also known as the canicular year.
Online Etymology Dictionary, © 2010 Douglas Harper
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