AST101H1 Lecture 4: CLASS 4
5 Dec 2017
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On the darkest nights on can identify about 3000 but in the city it becomes less. The earth rotates around an axis going through the north and south poles. The axis point (nearly) at the star polaris. Therefore, polaris (nearly) doesn"t move on the sky. Motion of the sun is what gives us seasons. Rises in the east and sets in the west. You see different constellations at different times of the year. If the axis of the earths rotation was perpendicular to the orbital plane, there would be no seasons at all. If the axis of the earth"s rotation was parallel to the orbital plane the seasons.
