ASTR 103 Lecture Notes - Lecture 2: Angular Diameter, Night Sky, Azimuth
14 Sep 2018
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Document Summary
Constellations: a region of the sky, 88 constellations fill the entire sky. Celestial sphere: way to map night sky as seen from earth, earth placed at center, identify n and s celestial poles, and two circles the celestial equator and the ecliptic. Angular size: object"s angular size appears smaller if it is farther away, angular size = physical size divided by distance. Why do the constellations that we see depend on latitude: position on earth determines which constellations remain below horizon, sky varies with latitude but not longitude, altitude of celestial pole = your latitude. Why do the constellations that we see depend on time of year: night sky changes throughout year because of earth"s changing position in its, time of year determines location of sun in the sky orbit around the sun. What does the universe look like from earth: can see over 2000 stars and milky way with naked eye.
