बृहत्संहिता (आचार्य वराहमिहिर - स्थापत्य, खगोल, मौसम व जल विज्ञान)

96 बृहत्संहितायाम् [Adh. VIII. Sl. 22
So that for every 3750 solar years we have 3794 years of Jupiter.
Therefore 1 solar year = 1 + 44/3750 years of Jupiter.
To find out the number of Jupiter years that had elapsed (in
Kaliyuga) at the time of the commencement of the Salivahana era,
we have to proceed thus :
The number of solar years that have passed from the beginning
of Kaliyuga till the commencement of the Saka era is 3179. This
converted into Jupiter years will be 3794/3750 × 3179 or 3216 1126/3750
Now it is known that Kaliyuga commenced in the year Vijaya
(the 27th year from Prabhava, which is the first year in a cycle of
60 years of Jupiter).
Therefore, 3216 1126/3750 + 26 or 3242 1126/3750 being divided by 60,
the remainder will give the particular year of Jupiter (in his cycle of
60 years) from Prabhava at the time of commencement of the Saka
era, and this remainder is 2 1126/3750 which is the 3rd year or the year
Sukla of the cycle.
Coming down to the period subsequent to the commencement of
the Saka era, say the present time (वर्तमान शक-Vartamana Saka
1868 April 1945), the number of Jupiter years that have elapsed
will be 1867 + (44 × 1867)/3750 + 2 1126/3750 from the beginning of Prabhava
or 1867 + 21 3398/3750 + 2 1126/3750 or 1891 774/3750 which indicates that it
is the 32nd year of the cycle or Vilambi. But actually, it is
Hemalamba. The reason is that the figures for Jupiter's years as
given by Aryabhatta or as per Surya-siddhanta are a bit more than
that of Varahamihira. His figure 8589 appearing in Sloka 20 is
different from 8626 that we got above. Calculating backwards
from 8589, we find the number of siderial revolutions of Jupiter
according to Varahamihira to be 364190000. This is probably the.
correct figure.
Sloka 22 gives a clue to find out the particular lunar mansion
in which Jupiter may happen to be at any given time.