 The iconography and use of the drekkana's is mention earliest by Sphujidhvaja in Yavanajataka (269-70 CE), and given detailed treatment by Varahamihira in his Brihat-Samhita (550 CE).Modern scholars believe the decans were imported into India through the Greeks, who learned about them from the Egyptians.There are multiple types of drekkana in use in Indian astrology.