वेदों की प्राचीनता एवं काल-निर्णय / ओरायन (लोकमान्य बाल गंगाधर तिलक - खगोलीय वैदिक शोध)

62 THE ARCTIC HOME IN THE VEDAS.
Vedic bards had, by that time, attained considerable proficiency
in practical astronomy. There were daily, fortnightly, monthly,
quarterly, half-yearly and yearly sacrifices, which, as I have
elsewhere shown, also served as chronometers in those days. *
The Taittirîya Saṁhitâ and the Brâhmaṇas distinctly mention a
lunar month of thirty days and a year of twelve such months, to
which an intercalary month was now and then added, to make
the lunar and the solar year correspond with each other. The
ecliptic, or the belt of the zodiac, was divided into 27 or 28
divisions, called the Nakṣhatras, which were used as mile-stones
to mark the annual passage of the sun, or the monthly revolution
of the moon round the earth. The two solstitial and the two
equinoctial points, as well as the passage of the sun into the
northern and the southern hemisphere, were clearly distinguished,
and the year was divided into six seasons, the festivals in each
month or the year being accurately fixed and ascertained. The
stars rising and setting with the sun were also systematically
observed and the eastern and western points of the compass
determined as accurately as the astronomical observations of the
day could permit. In my Orion or the Antiquity of the Vedas, I
have shown how the changes in the position of the equinoxes
were also marked in these days, and how they enable us to
classify the periods of Vedic antiquity. According to this
classification the Taittirîya Saṁhitâ comes under the Kṛittikâ pe-
riod (2500 B. C.), and some may, therefore, think that the details
of the Vedic calendar given above are peculiar only to the later
Vedic literature. A cursory study of the Ṛig-Veda will, however,
show that such is not the case. A year of 360 days, with an inter-
calary month occasionally added, or a year of twelve lunar months.

• See The Orion or the Antiquity of the Vedas, Chap. II.