sunup

noun2

1. •
   (US) The time of day when the sun appears above the eastern horizon.

   • “Shagbark, that was risky on your part; even where it lies it is much closer than I like, for we shall all have to see it in the morning.” “No, you won’t; it’ll be gone afore sunup.” — 1909
2. •
   (US) The change in color of the sky at sunup.