ब्राह्मस्फुटसिद्धान्त (ब्रह्मगुप्त - शून्य, कुट्टक, बीजगणित एवं सम्पूर्ण २१ अध्याय सान्वय सटीक)

figured as a wheel cart, and comprises five stars, out of the seven which the Greeks named the Hyades. The Arabs, however, like the Hindus, reckon five stars only in the asterism. Sir William Jones supposes them to be in the head and neck of the Bull; they probably are α, ρ, γ, δ, ε Tauri, agreeably to Mons. Bally's conjecture. 5. Mṛgaśirā, the fifth nakṣatra, represented by an antelope head, contains three stars; the same which constitute the fifth lunar mansion Hakāh; for the distance of 10°S assigned to the northern star of this nakṣatra, will agree with no other but one of the three in the head of Orion. The difference of longitude (24° to 25½°) from Kṛttikā corresponds with sufficient exactness; and so does the longitude of its circle of declination (62° to 63°) from the end of Rewatī; since the true longitude of λ Orionis, from the principal star in Revatī (ζ piscium) is 63½°. 6. Ārdrā, the sixth nakṣatra, consists of a single bright star, described as a gem, and placed in 9°S (by some in 11°) and at the distance of 4⅓ to 4° in longitude from the last asterism. This indicates the star in the shoulder of Orion (a orionis). The sixth lunar mansion is named by the Arabs as Hanāh; and comprises two stars in the feet of the second twin, according to Ulugh Beg, though others make it to be a shoulder. Mohammad of Tizin allots five stars to this constellation; and the Kāmūs, among various meanings of Hanāh, says, that it is a name for five stars in the left arm of Orion; remarking also, that the lunar mansion is named Tahāyī, comprising three stars called Tahyāt. Obviously here the Indian and Arabian asterisms are irreconcileable. 7. Punarvasū (used in a dual number) is the seventh nakṣtra, and is represented by a house, or even a bow, and it includes four stars, among which the principal and eastern one is 30° or 32° from the fifth asterism; but has been placed by all authorities in 6°N. This agrees with (β Geminorum) one of the two stars in the heads of the Twins, which together constitute the seventh lunar mansion ziraā, according to Mohammad of Tus and Mohammad of Tizin and other Arabian authorities. The seventh lunar mansion of Arabs is named ziraā ul ased according to Jauhari and other cited by Hyde in his Commen-