'astrologically' originates from Greek, specifically the word 'astrologia', where 'astron' meant 'star' and 'logia' meant 'study'.

'astrologia' passed into Latin as 'astrologia', into Old French as 'astrologie', then into Middle English as 'astrologie' and modern English 'astrology'; the adjective 'astrological' and the adverb 'astrologically' were formed in English from that root.

Initially it meant 'study of the stars'; over time the sense broadened to practices and interpretations about celestial influence, and as an adverb it now means 'in a manner relating to astrology' or 'from an astrological point of view'.