The beliefs, practices, or knowledge system of the ancient Chaldaeans, especially their astronomy and astrology.
From 'Chaldaea' plus the suffix '-ism' (a system or set of beliefs), referencing the distinct worldview and practices of the Chaldean civilization.
Chaldaism represented the cutting edge of ancient science—their 'astrology' was actually sophisticated mathematical astronomy, and their influence on Greek, Persian, and Indian astronomy shaped how all humans understood the stars for millennia.
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