Bīrūnī, Muḥammad ibn Aḥmad, Alberuni's India (v. 2)

(London :  Kegan Paul, Trench, Trübner & Co.,  1910.)



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The word sctmvatsctrct, which means the years, is a tech- Expiana-
nical term for cycles of years constructed on the basis termssaiK*^
of the revolutions of Jupiter and the sun, the heliacal ^hasTtyduia.
rising of the former being reckoned as the beginning.
It revolves in sixty years, and is therefore called shash-
tyctbda, i.e. sixty years.

We have already mentioned that the names of the a year is
lunar stations are, by the names of the months, divided over^by that
into groups, each month having a namesake in the cor- which the
responding group of stations.    We have represented risii^g^of
these things in a table, in order to facilitate the subject occ'ur.s.^
(v. i. 218).    Knowing the station in which the heliacal
rising of Jupiter occurs, and looking up this station
in the just-mentioned table, you find at the left of it
the name of the month which rules over the year in
question.    You bring the year in connection with the
month, and say, e.g. the year of Gctitra, the year of Vai-
sdkha, &c.    For each of these years there exist astro¬
logical rules which are well known in their literature.

For the computation of the lunar station in which How to find
the  heliacal  rising of  Jupiter occurs,   Varahamihira station'of
gives the following rule in his Samhitd:—                      heUao*ai^ris-

"Take the Sakakala, multiply it by 11, and multiply tio^ifrom ^
the product by 4, You may do this, or you may also hfra'sSaTii-
multiply the Sakakala by 44.    Add 8589 to the product viii.'2'o,Ti.
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