First light (astronomy)
Term in astronomy for the first time a telescope is used to look at the Universe / From Wikipedia, the free encyclopedia
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This article is about the testing of telescopes. For the first light of dawn, see Twilight § Nautical twilight. For the cosmogonical age, see first light (cosmology).
In astronomy, first light is the first use of a telescope (or, in general, a new instrument) to take an astronomical image after it has been constructed. This is often not the first viewing using the telescope; optical tests will probably have been performed to adjust the components.