Astronomy 1021 Lecture Notes - Lecture 2: Equatorial Coordinate System, Celestial Equator, Constellation
16 Jan 2019
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Stars appear to be on flat surface orbiting the earth. Imagine the earth is within a snow globe. However, we actually see in 3d, where distances of stars vary. Brightest star to least bright given variables (alpha, beta, gamma, delta and so on) Local meridian: line that goes through north point of horizon, through zenith, and to south point. Altitude: angle between the observers local horizon, and the point of interest (e. g. star), horizon has an altitude of 0 degrees, and a zenith of 90. Azimuth: angle around horizon to point of interest, measure angle clockwise from north, which has an azimuth of 0 degrees. Latitude: horizontal, same as equator, and north pols stars" altitude, affects when. Longitude: vertical, same as prime meridian, affects what. London ontario: latitude: 43n longitude: 81 w. 60 arc seconds ( ") in 1 arc minute. Objects rise in east, and set in west (including sun, moon, planets and stars)
