Rikujinshinka (an ancient form of divination from China based on astronomy and Kanshijutsu (Oriental zodiac)) is one type of Shikisenjutsu (an ancient form of divination from China that uses a board called Shikiban and a spoon-like tool called a Choku), and, along with Taiitsushinsu (one of the divinations that was invented in China and mainly cast about important matters such as politics and economics) and Kimontonko (an ancient form of divination from China which is still in use in China, Taiwan, Singapore, and the Chinese diasporas in Southeast Asia), they are collectively called 'Sanshiki.'
六壬神課は式占術の一つであり、太乙神数、奇門遁甲と合わせて「三式」と呼ばれる。