premise: earth is a kind of celestial object sent2: stars appear to move relative to the horizon during the night sent3: a star is a kind of celestial object / celestial body sent4: the earth rotating on its axis causes stars to appear to move across the sky at night sent5: apparent motion is when an object appears to move relative to another object 's position.
hypothesis: the earth rotating on its axis causes stars to move relative to the horizon during the night