Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Dawn; sunrise; the moment at which the sun can first be seen on the horizon.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the first light of day

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  • 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