Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun
Dawn ;sunrise ; the moment at which the sun can first be seen on thehorizon .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the first light of day
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mitch4 commented on the word first light
In observational astronomy, the date or moment when a newly-built telescope first makes a complete observation, with light from the observed object making the complete path through the optics to the photo plate or data-collecting instrument.
Related: The first end-to-end or complete trial run of a complex technology system, such as a particle collider or a data network.
January 1, 2015