Relating to astronomy or astronomers; also used informally to mean 'extremely large' or 'enormous in scale.'
From Greek 'astronomikos,' combining 'astron' (star) and 'nomos' (law). The metaphorical sense developed because astronomical numbers and distances are incomprehensibly vast.
We use 'astronomic prices' for expensive things because even our ancestors knew that star-distances were so huge that the number was beyond human comprehension—making it perfect for big numbers!
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