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Astronomical Coordinate System

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This presentation contains general description of preferred coordinates system in astronomy .

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Astronomical Coordinate System

  1. 1. ASTRONOMICAL COORDINATE SYSTEM BY, ISHAN K PATEL B.TECH-AEROSPACE ENG./5TH SEM
  2. 2. THE ULTIMATE GOAL • Position of the Objects • Relative Motion • Dimensions and Characteristics
  3. 3. TERRESTRIAL COORDINATE SYSTEM
  4. 4. THE CELESTIAL SPHERE
  5. 5. THE EQUATORIAL COORDINATE SYSTEM
  6. 6. THE HORIZON SYSTEM
  7. 7. TRANSFORMATION FROM HORIZONTAL SYSTEM TO EQUATORIAL SYSTEM Measured observed coordinates in the horizontal system, azimuth A and altitude a, can be transformed to (co-rotating) equatorial ones, hour angle HA and declination Dec, for an observer at geographical latitude B, by the transformation formulae: cos Dec * sin HA = cos a * sin A sin Dec = sin B * sin a + cos B * cos a * cos A cos Dec * cos HA = cos B * sin a + sin B * cos a * cos A
  8. 8. EFFECT OF EARTH’S ROTATION • Objects seem to rotate around the celestial poles • Move along the circle of constant declination • Culmination of Circumpolar objects
  9. 9. QUESTIONS!

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