as·tro·nom·i·cal

1. of or relating to astronomy.
synonyms: planetary, stellar; celestial, astral

2. informal (of an amount) extremely large.
“he wanted an astronomical fee”

synonyms: huge, enormous, very large, prodigious, monumental, colossal, vast, gigantic, massive; substantial, considerable, sizable, hefty; inordinate; informal astronomic, whopping, humongous, ginormous.