sunset
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sunset
1. the daily disappearance of the sun below the horizon
2. the atmospheric phenomena accompanying this disappearance
3. the time at which the sun sets at a particular locality
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
sunset
[′sən‚set] (astronomy)
The exact moment the upper limb of the sun disappears below the horizon.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.