PHYS 1000 Chapter Notes - Chapter 4: Celestial Coordinate System, Celestial Equator, Right Ascension
26 Jan 2019
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4. 1 earth and sky: the terrestrial system of latitude and longitude makes use of the great circles called meridians. Longitude is arbitrarily set to 0 at the royal observatory at greenwich, England: an analogous celestial coordinate system is called right ascension (ra) and declination, with 0 of declination starting at the vernal equinox, these coordinate systems help us locate any object on the celestial sphere. 4. 2 the seasons: the familiar cycle of the seasons results from the 23. 5 tilt of earth"s axis of rotation. At the summer solstice, the sun is higher in the sky and its rays strike. The convention of the international date line is necessary to reconcile times on different parts of earth. Today, most of the world has adopted the gregorian calendar established in 1582 while finding ways to coexist with the older lunar calendars" system of months. Moon always keeps the same face toward earth.
