Hourly Airmass TableStar Name Right Ascension (hh mm ss) Declination (dd mm ss) Epoch (yyyy) Altitude of twilight sun (degrees) Date: Year: Month: January February March April May June July August September October November December Day: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Observability Table From: Year: Month: January February March April May June July August September October November December Day: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 To: Year: Month: January February March April May June July August September October November December Day: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 NOTE: Valid for TUG-BAKIRLITEPE Antalya-TURKEY By Umit Kiziloglu using Skycalc by John Thorstensen (john.thorstensen@dartmouth.edu)