Astronomical Coordinate System
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Transcript of Astronomical Coordinate System
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ASTRONOMICAL COORDINATE SYSTEM
BY,
ISHAN K PATEL
B.TECH-AEROSPACE ENG./5TH SEM
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THE ULTIMATE GOAL
• Position of the Objects
• Relative Motion
• Dimensions and Characteristics
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TERRESTRIAL COORDINATE SYSTEM
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THE CELESTIAL SPHERE
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THE EQUATORIAL COORDINATE SYSTEM
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THE HORIZON SYSTEM
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TRANSFORMATION FROM HORIZONTAL SYSTEM TO
EQUATORIAL SYSTEMMeasured 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
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EFFECT OF EARTH’S ROTATION
• Objects seem to rotate around the celestial poles
• Move along the circle of constant declination
• Culmination of Circumpolar objects
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QUESTIONS!