Definitions for "LUMINARY"
One who throws light upon a subject; as an editor by not writing about it.
Any body that gives light, especially one of the heavenly bodies.
an object that gives light
One who illustrates any subject, or enlightens mankind; as, Newton was a distinguished luminary.
The luminaries were what traditional astrologers called the two astrological "planets" which were the brightest and most important objects in the heavens, that is,
a celebrity who is an inspiration to others; "he was host to a large gathering of luminaries"