Final answer:
A star with a right ascension of 1.0 hours will rise approximately 1.0 hour after the vernal equinox each day, due to the rotation of the celestial sphere.
Step-by-step explanation:
The concept in question is right ascension (RA), which is a coordinate used in astronomy to measure the east-west positions of celestial bodies, similar to longitude on Earth. A star with a right ascension of 1.0 hours means that it lies 1 hour east of the vernal equinox along the celestial equator. Since the celestial sphere rotates around Earth once every 24 hours (a sidereal day), this star will rise approximately 1.0 hour after the vernal equinox.