ASTR 170B1 Lecture Notes - Lecture 3: Scientific Method, Sidereus Nuncius, Minute And Second Of Arc
28 Sep 2016
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Document Summary
Dailymotion defines our day and night (the sun always moves east to west) Like the stars, rises on eastern horizon, moves in a circular arc across the sky. Crosses meridian at noon (highest in sky) But the locations of the rising and setting sun change slightly. The sun drifts slowly though the fixed stars, moving around the sky in one year (defines the year) Path of sun against the fixed stars called the ecliptic (related to eclipse) Constellations near this path form the zodiac. Is a result of earth"s orbiting the sun once per year. See the night sky opposite the sun, changes with earth"s. Height above horizon at noon (angular distance) Points on horizon where it rises and sets shift daily. Rising and setting points stop shifting from day to day. Earth"s axis of spin tilted 23. 5 degrees from axis of orbit around sun. During year, north/south pole tipped alternatively toward/away from the sun.
