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

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

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(     204      )
 

CHAPTEE  LXXIX.

ON  TIIE  YOGAS.

Page 299. TiiEbE are times which the Hindus think to be most
unlucky and during which they abstain from all action.
They are numerous.    We shall here mention them.

Explanation      There  are two  yogas regarding which  all  Hindus

of vyali'pnta,

and vaidh-      agree, VIZ. :----

■    '                (i.) The moment when sun and moon together stand

on two circles, which are, as it were, seizing each other,
i.e. each pair of circles, the declinations of which, on
one and the same side (of either solstice), are equal.
This yoga is called vyctiipdta.

(2.) The moment when sun and moon stand together
on two eq^v,a,l circles, i.e. each pair of circles, the de¬
clinations of which, on different sides (of either solstice),
are equal.    This is called vaidhritct.

It is the signum of the former that in it the sum of
the corrected places of sun and moon ti'epresents in any
case the distance of six zodiacal signs from 0° of Aries,
while it is the signum for the latter that the same sum
represents the distance of twelve signs. If you compute
the corrected places of sun and moon for a certain time
and add them together, the sum is either of these signa,
i.e. either of these two yogcts.

If, however, the sum is less than the amount of the
signum or larger, in that case the time of equality (i.e.
the time when the sum is equal to either of the signet)
is computed by means of the difference between this
sum and the term in question, and by means of the
  Page 204