Becasue the earth rotates once every twenty-four hours, and orbits the sun once a year, the constellations in view depend on the time of night and the time of year.
(the earth; rotates; T:once every twenty-four hours) (the earth; orbits; the sun; T:once a year) (the constellations in view; depend; on the time of night and the time of year)
the earth the earth the constellations in view
rotates orbits depend
T:once every twenty-four hours
the sun T:once a year
on the time of night and the time of year