astronomical Idioms & Phrases

Astronomical clock

  • . See under Clock.
Webster 1913

Astronomical day

  • . See under Day.
Webster 1913

Astronomical fractions, Astronomical numbers

  • . See under Sexagesimal.
Webster 1913

astronomical telescope

  • noun any telescope designed to collect and record electromagnetic radiation from cosmic sources

astronomical unit

  • noun a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)

astronomical year

  • noun the time for the earth to make one revolution around the sun, measured between two vernal equinoxes
    tropical year; equinoctial year; solar year.

Lunar astronomical year

  • the period of 12 lunar synodical months, or 354 days, 8 hours, 48 minutes, 36 seconds.
Webster 1913