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