'astronomical' originates from the Greek word 'astronomikos', where 'astron' meant 'star' and 'nomos' meant 'law'.

'astronomikos' transformed into the Latin word 'astronomicus', and eventually became the modern English word 'astronomical'.

Initially, it meant 'pertaining to the laws of the stars', but over time it evolved into its current meanings of 'relating to astronomy' and 'extremely large'.