AST101H1 Lecture Notes - Lecture 4: Northern Hemisphere
27 Sep 2016
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Ast101 week two september 22, 2016. On the darkest nights, one can identify about 3000. On a very dark night away from the city . When we look at the sky, we can imagine shapes. Where they are in the sky does. Distance b/t us and pluto if far smaller than distance b/t us and the sun. The earth rotates around an axis going through the north and south poles. That axis points (nearly) at the star polaris. Therefore, polaris (nearly) doesn"t move on the sky. Ancients thought there was a big sphere and whole sky turning around that point. All the stars are fixed in space basically, moving very slowly, the earth is actually turning. From south pole we wouldn"t be able to see it because it be below the earth, we"re on the opposite side. From toronto we need to look for angle to see polaris. From equator on march 21, polaris would be straight along the horizon.
