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When a telescope or astronomical instrument is first used to take an image after construction.
I just started to build a 100 meter optical telescope in my backyard: first light will be in 2038.
by LegitSciNtech August 18, 2011
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Oct 3 Word of the Day
I couldn’t care less (but one must keep up appearances, right?)
Frenemy has a family tragedy. "Thoughts and prayers."
by November 05, 2018
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2
The first lighting of the sky after night and before dawn when the stars begin to dim. Surfers first check the waves at this time.
Hey dude, I'll meet you at Cardiff at first light to shred the gnar-gnar.
by NatureGirlENC April 13, 2018
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