单词	astrometry
释义	astrometry /əˈstrɒmɪtri / noun [mass noun] The measurement of the positions, motions, and magnitudes of stars.In this way, astronomers will perform very precise astrometry to detect the reflex motion of stars due to orbiting planets.... One technique, known as astrometry, involves precisely measuring the position of a star. The main branches are astrometry, celestial mechanics, and astrophysics. Derivatives astrometric adjective ... To date there have been no successful detections of extrasolar planets with the astrometric method. Tycho had collected in one place the finest astrometric instruments of his day - four decades before Galileo introduced the astronomical telescope. After obtaining the images, she used astrometric software to determine the coordinates of the target asteroid's apparent position in each image.
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