Etymology
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astronomical (adj.)

1550s, "pertaining to astronomy," from astronomy + -ical. Popular meaning "immense, concerning very large figures" (as sizes and distances in astronomy) is attested from 1899. Astronomical unit (abbreviation A.U.) "mean distance from the Earth to the Sun," used as a unit of measure of distance in space, is from 1909. Related: Astronomically.

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Definitions of astronomical

astronomical (adj.)
relating or belonging to the science of astronomy;
Synonyms: astronomic
astronomical (adj.)
inconceivably large;
Synonyms: astronomic / galactic
From wordnet.princeton.edu