Crossword Genius

With 41-Across, a celestial event ... or a hint to four squares in this puzzle (5)

Ross

I believe the answer is:

solar

(Other definitions for solar that I've seen before include "Sort of power" , "Using the sun's energy" , "revolutionary system" , "Of the sun, as ray or panel" , "Powered by the sun" .)

I've seen this clue in The New York Times.
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