From our point of view on earth, it feels as if we are stationary and the celestial sphere and sun are all rotating around us. in actuality, however, the earth is moving, rotating on an axis that is tilted with respect to the orbit it takes around the sun. open the astrotour called "the earth spins and revolves." watch the introduction, and the first half of the explanation (up until the interactive part). then, choose one of the following conclusions that best explains the cause of the shift from day to night.
choose one: a. the shift from day to night is caused by the orbit of the earth around the sun. b. the shift from day to night is caused by the sun's orbit around the earth. c. the shift from day to night is caused by the rotation of the earth around its axis. d. the shift from day to night is caused by the tilt of the earth's rotation axis in relation to its orbit around the sun.