Lecture 05: Mapping Earth & Sky
Where are we? Where is someplace else? And how do I get there from\nhere? These are questions we need to answer both on the Earth and in\nthe sky to assign a location to a place or celestial object on the\nsurface of a sphere. This lecture includes a review of angular units\nand the terrestrial system of latitude and longitude on the spherical\nEarth. We then define the Celestial Sphere, with its Celestial Equator\nand Poles, and begin to define an analogous coordinate system on the\nsky. An important wrinkle is that what part of the sky we see at any\ngiven time depends on both where we are on the Earth, and what date/time\nit is. This gives us the elements of the coordinate system we will need\nto begin our exploration of motions in the sky in the next lectures.\nRecorded 2007 Sep 25 in 1000 McPherson Lab on the Columbus campus of The\nOhio State University.