Acrux

[ey-kruhks]

A·crux

[ey-kruhks]
noun Astronomy.
a star of the first magnitude in the constellation Southern Cross.

Origin:
A (alpha) + crux
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Acrux 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
one fourth of the moon's monthly revolution
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