01:750:109 Lecture Notes - Lecture 4: Minute And Second Of Arc, Angular Diameter, Azimuth
19 Oct 2018
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Document Summary
Imagining what is on the other side of the earth. An object"s altitude (above horizon) and azimuth (along horizon) specify its location in your local sky. Theodolite (object that can do something related to this) Meridian points both south, north, and to zenith. The horizon - the limit of the sky we are allowed to see because of the presence of the earth. Horizon is a plane that cuts what we can see from what we cannot see. More clear when we look at the stars (don"t see same stars everywhere on earth). Horizon determines what you would be able to see at a given time. Appears this big = from this distance, is makes this angle . We measure regions in the sky using angles. From the horizon to the zenith: 90 degrees. Moon looks big, but measuring the angular size makes it smaller. Angular distance: angle that appears to separate two objects in the sky.
