skytime

noun3

1. •
   Time that an astronomer has booked for use of a major telescope.

   • But it's possible for an astronomer in say, England, or Hawaii, to book skytime here and scrutinize the results from his own laboratory via computer. — 1995
2. •
   The time when a vehicle such as an airplane is in flight.

   • Skytime to Lebanon or Israel is twelve minutes, add four more for Jordan. — 1957
3. •
   Time as measured by looking at the sky.

   • At sunset, which was in a grey bank with moist gold dabs and racks, the whole round of skytime had level clouds naturally lead-colour but the upper parts ruddled, some more, some less rosy. — 1972