The Vishnu Purana
Chapters
The Vishnu Purana: Book II: Chapter VIII

225:19 These are the names of the months which occur in the Vedas, and belong to a system now obsolete, as was noticed by Sir Wm. Jones. As. Res. III. 258. According to the classification of the text, they correspond severally with the lunar months Mágha, Phálguna, Chaitra, Vaiśákha, Jyesht́ha, Áshárha, or from December to June; and with Śrávańa, Bhádra, Áswina, Kártika, Agraháyana, and Pausha, from July to December. From this order of the two series of the months, as occurring in the Vedas, Mr. Colebrooke infers, upon astronomical computations, their date to be about fourteen centuries prior to the Christian era. As. Res. VII. 283.

226:20 The Váyu has the same names, but ascribes a different descent to the first, making Sudháman the son of Viraja. Sankhapád is the son of Kardama: the other two are the sons of Parjanya and Rajas, consistently with the origin ascribed to these Lokapálas in the patriarchal genealogies of that Puráńa (see p. 83).

226:21 Allusion is here made to some divisions of the celestial sphere which are not described in any other part of the text. The fullest, but still in some respects a confused and partly inaccurate account is given in the Matsya Puráńa; but a more satisfactory description occurs in the comment on the Bhágavata, there cited from the Váyu, but not found in the copies consulted on the present occasion. According to those details, the path (Márga) of the sun and other planets amongst the lunar asterisms is divided into three portions or Avasht́hánas, northern, southern, and central, called severally Airávata, Járadgava (Ajagava, Matsya P.), and Vaiswánara. Each of these, again, is divided into three parts or Víthis: those of the northern portion are termed Nágavithi, Gajavíthi, and Airávati; those of the centre are Árshabhí Govíthí, and Járadgaví; and those of the south are named Ajavíthí, Mrígavithí, and Vaiswánarí. Each of these Víthis comprises three asterisms.

Nágavíthi

Aswiní
Bharańí
Krittiká

Gajavíthí

Rohiní
Mrigaśiras
Ardrá

Airávati

Punarvasu
Pushyá
Ásleshá

Árshabhí

Maghá
Púrvaphalguní
Uttaraphalguní

Govíthí

Hastá
Chitrá
Swáti

Járadgaví

Viśákhá
Anurádhá
Jyesht́há

Ajavíthi

Múlá
Purváshád́há
Uttaráshád́há

Mrigavíthí

Śravańá
Dhanisht́há
Satábhishá

Vaiswánarí

Púrva Bhádrapadá
Uttara Bhádrapadá
Revatí.

[paragraph continues] See also As. Res. IX. table of Nakshatras, 346. Agastya is Canopus; and the line of the goat, or Ajavíthi, comprises asterisms which contain stars in Scorpio and Sagittarius.