1) Aurora 2) Bedtime for a vampire 3) Break of day 4) Break of the day 5) Cockcrow 6) Crack of dawn 7) Crow inducer 8) Crowing cue 9) Daily start 10) Dawn 11) Dawn event 12) Dawning 13) Daybreak 14) Dayspring 15) Early time 16) First light 17) Hour 18) Morning 19) Sunrise 20) The crack of dawn 21) The first light of day 1) Aurora 2) Break of day 3) Cockcrow 4) Dawn 5) Dawning 6) Daybreak 7) Dayspring 8) Morning 
• (n.) Sunrise.
Sun'up` noun Sunrise. [ Local, U.S.] « Such a horse as that might get over a good deal of ground atwixt sunup and sundown.» Cooper. 
sunrise, esp. the time of sunrise.