astronomical Idioms & Phrases
Astronomical fractions, Astronomical numbers
noun any telescope designed to collect and record electromagnetic radiation from cosmic sources
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)
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.
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