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The system of Chinese astrology was elaborated during the Zhou dynasty ( 1046 – 256 BC ) and flourished during the Han Dynasty ( 2nd century BC to 2nd century AD ), during which all the familiar elements of traditional Chinese culture – the Yin-Yang philosophy, theory of the 5 elements, Heaven and Earth, Confucian morality – were brought together to formalise the philosophical principles of Chinese medicine and divination, astrology and alchemy.