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

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



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Methods of


60                         ALBERUNTS INDIA.

For Mars, 4,308,768,000.

For Mercury, 4,288,896,000.

For Jupiter, 4,313,520,000.

For Venus, 4,304,448,000.

For Saturn, 4,305,312,000.

For the Sun's apsis, 933,120,000.

For the Moon's apsis, 1,505,952,000.

For the ascending node, 1,838,592,000 (v. the notes).

At the same moment, i.e. at the beginning of the kali¬
yuga, sun and moon stood according to their mean
motion in 0° of Aries, and there was neither a plus nor
a minus consisting of an ctdhimdsa month or of Una¬
rdtra days.

In the above-mentioned cctnones or calendars we find
^kiutdji^l'!"'' 'the following method :—" The ahargctna, i.e. the sum of
uk'aVld the days of the date, is, for each planet respectively,
multiplied by a certain number, and the product is
divided by another number. The quotient represents
complete cycles and fractions of cycles, according to
mean motion. Sometimes the computation becomes
perfect simply by this multiplication and division.
Sometimes, in order to get a perfect result, you are
compelled once more to divide by a certain number
the days of the date, either such as they are, or multi¬
plied by some number. The quotient must then be
combined with the result obtained in the first place.

Sometimes, too, certain numbers are adopted, as e.g.
the basis, which must either be added or subtracted for
this purpose, in order that the mean motion at the
beginning of the era should be computed as beginning
with 0° of Aries. This is the method of the books
Khctndctkhddyctkct and Karctnatilctka. However, the
author of the Karanasdra computes the mean places of
the planets for the vernal equinox, and reckons the
ahargana from this moment. But these methods are
very subtle, and are so numerous, that none of them has
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