The Turyāṁśa(D4) is one-fourth a rāśi measuring 7°30′ arc. There are 48 Turyāṁśa in the zodiac as 4×12=48. Just as the horā D2 chart maps to the second house of the rāśi chart in the physical plane of consciousness, the Turyāṁśa being a D4 chart, maps to the fourth house.