In a Mirror, Darkly (1) - S4-E18
Corrected entry: At the end of the opening credits for this episode and its sequel, Earth is shown rotating from west to east, the opposite direction as in real-life, likely to highlight the differences in the mirror universe.
Correction: Since they have never shown the sun rising in the mirror universe, the Earth just might rotate west to east. The phenomenom is called retrograde rotation. Venus spins west to east for example.
Rlvlk