sunrise, especially the time of sunrise.

1705–15, Americanism; sun + up, on the model of sundown Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sunup (ˈsʌnˌʌp)
another name (esp US) for sunrise

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
By sunup of the fourth day, the ailing group holed up in a hideout to try to
  get a few hours of uninterrupted sleep.
Insofar as possible, blasting operations above ground shall be conducted
  between sunup and sundown.
Blasting operations shall be conducted between sunup and sundown, whenever
If possible, conduct blasting operations after sunup and before sundown and
  during periods of clear visibility.
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