PHYS 1600- Midterm Exam Guide - Comprehensive Notes for the exam ( 83 pages long!)
11 Oct 2017
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1 4 earth"s rotation creates the day-night cycle and its revolution defines a year. We do not feel the rotation because the earth is so big in relation to us. Diurnal motion: daily motion of celestial bodies. Revolution: the motion of any astronomical object around another. The length of any cycle of motion that is measured with respect to the stars sidereal period. Zenith: the point directly overhead anywhere on earth. Circumpolar: stars and constellations that never go below the horizon are called circumpolar. The angle at which the stars rise and set depends on your viewing latitude. 1 5 the seasons result from the tilt of earth"s rotation axis combined with earth"s revolution around the sun. Ecliptic: sun"s annual path around the celestial sphere. Earth orbits the sun in a plane also called the ecliptic. Earth"s rotation axis is tilted 23 away from a line perpendicular to the ecliptic/ ecliptic + celestial equator are different circles tilted 23 .
