NATS 1745 Lecture Notes - Lecture 3: Sunday
19 Oct 2015
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Describe the general sense of how the following objects move in the sky: stars; planets; sun; moon. Rises and sets due to rotation of earth on its axis. Path that sun takes through sky changes through year due the revolution of the earth in its orbit around the sun, and tilt of the earth"s rotation axis. We also see eclipses of sun: which are understood today to occur when moon blocks light from sun (not understood by ancients) Rises in east, sets in west: due to rotation of earth. Goes through phases: due to relative positions of sun, earth, moon. Some stars rise and set due to rotation of earth: of those we can see different stars and constellations at different times of the year due to position of earth in its orbit around sun. We face different parts of the galaxy at night and can see different stars. Rise and set due to earth"s rotation.
