Lexell
səl noun
Astronomy. a comet that passed closer to the earth than any other comet (1770), but now has an orbit that is too distant from the earth for it to be observed.
Origin:
after Anders Jean Lexell (1740–84), Finnish-born mathematician, who calculated its orbit
after Anders Jean Lexell (1740–84), Finnish-born mathematician, who calculated its orbit
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Lexell
is always a great word to know.
So is luminosity. Does it mean:
| the brightness of a star in comparison with that of the sun: the luminosity of Sirius is expressed as 23 and indicates intrinsic brightness 23 times greater than the sun |
| the gaseous envelope surrounding a heavenly body |
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