Right ascension

How many minutes of right ascension are equivalent to 1 degree of arc?

4

def: 24 hours_RA = 360 deg_arc

=> 1 hour_RA = 360/24 = 15 deg_arc
=> 1 minute_RA = 15/60 = 0.25 deg_arc
=> 1 deg_arc = 1/0.25 = 4 minute_RA /QED