astronˈomize or astronˈomise intransitive verb

To study astronomy

Astronomer Royal noun

1. An honorary title awarded to a distinguished British astronomer
2. Until 1972, the director of the Royal Greenwich Observatory

astronomical time see time

astronomical unit noun

The earth's mean distance from the sun, about 92.9 million miles, used as a measure of distance within the solar system (abbrev AU)

astronomical year see under year