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-