"He [Jacobi] thinks that the Rigveda shows that the winter solstice took place in the month Phalguna, and on the ground of the precession of the equinoxes this must mean that the observation thus recorded was made in the third millenium B.C. This view ... he supports by the fact that in the Grhya Sitras, or manuals of domestic ritual, of much later date, the ceremonial of the wedding includes an injunction to the wife to look at a star called Dhruva, “fixed,” and this can only have originated at a time when « Draconis was in the vicinity of the pole, there being no other star which could be called fixed at any period coincident with the probable age of the Rigveda: further he contends that the fact that Krttikas, the Pleiades, are placed at the head of the list of twenty-seven or twenty-eight Naksatras, “lunar mansions,” in the Yajurveda and Atharvaveda Samhitas means that Krttikas marked the vernal equinox when the list was compiled, and this date fell in the third millenium B.C.'"