exam1-review - Astronomy 135: Archaeoastronomy Exam 1...

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Astronomy 135: Archaeoastronomy Exam 1 Review Topics Classical Astronomy Diurnal Motion The entire Celestial Sphere turns around the earth once per day from east to west, carrying everything with it. Objects on the Celestial Sphere reach highest altitude and transit when they cross the Meridian— the altitude of the object at this time depends on the object’s Declination and the observer’s latitude. Local Sidereal Time (RA circle on the Meridian) Local Solar Time (Hour Angle of the sun plus 12 hours) The diurnal motion defines the… Celestial Sphere and the Equatorial Coordinate System Right Ascension, Declination Celestial Equator, Celestial Poles Stars are essentially fixed on the Celestial Sphere Hour Angle Local Coordinate System Like a geodesic dome over your head, no matter where you are on the earth Altitude, Azimuth Horizon, Zenith, Meridian Measuring altitude with cross staffs, quadrants, sextants The altitude of the NCP in the local coordinate system is the same as latitude. Eratosthenes You can convert between Celestial (Equatorial) coordinates (RA, Dec) and Local coordinates (Alt, Az). This is useful, for example, for determining the rising or setting azimuth of an object as seen from a particular latitude. Seasonal Motion
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This note was uploaded on 10/15/2008 for the course ASTR 135 taught by Professor Michaelfaison during the Spring '08 term at Yale.

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exam1-review - Astronomy 135: Archaeoastronomy Exam 1...

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