The declination won't change. The right ascension will increase by about 15 degrees per hour or 0.25 degrees per minute. Actual The actual number is closer to 15.04 degrees per hour of time: (366.25)(360 * 360)/(365.25)(24 * 24). For RA expressed as time it would be about 1 1.002 hours in 1 hour of time: 366.25/365.25. 366.25 is the number of apparent revolutions of the celestial sphere in a year, and 365.25 is the number of apparent revolutions of the Sun - days. 24 is the number of hours in a day and 360 the number of degrees in a circle.