Related to Astrometer: astronomy, astronomer, Astronomers


n.1.An instrument for comparing the relative amount of the light of stars.
References in periodicals archive ?
He also invented the astrometer, which could measure the relative apparent brightness of a star from the observer's position.
At Palomar Observatory near Escondido, Calif., Shao and his colleagues recently paired two 0.4-meter infrared telescopes, located 100 meters apart, to serve as a high-resolution astrometer. The telescopes, which together form an infrared interferometer, combine their images, acting as a single large telescope.