The term "Sukuyodo" refers to a kind of astrology which was brought to Japan as a part of the Esoteric Buddhism by priests who studied abroad such as Kukai in the Heian period.
宿曜道（すくようどう）とは、平安時代、空海をはじめとする留学僧らにより、密教の一分野として日本へもたらされた占星術の一種。