The diagram below represents the apparent positions of the big dipper, with respect to polaris, as seen by an observer in new york state at midnight on the first day of summer and on the first day of winter.
the change in the apparent position of the big dipper between the first day of summer and the first day of winter is best explained by earth
(1) rotating for 12 hours
(2) rotating for 1 day
(3) revolving for 6 months
(4) revolving for 1 year