सिद्धान्तशिरोमणि: गणिताध्याय (भास्कराचार्य - ग्रहगणित, मध्यमाधिकार व स्पष्टाधिकार सटीक)

387
= 222638750 / 1317628 = 169 approximately. Hence the increase
of the Sun's longitude with respect to a node is
1 Rāśi + 2/3 (1 + 1/169)° I. In the beginning of the Kali-
yuga, the longitude of the node was 5 Rāśis—3°—13′ and
the arc moved by the Sun with respect to the node during
the course of half a lunation is 0—15—20, so that their sum
is 5 —18 —33. Here we have added for half a lunation
because the context is a lunar eclipse and the beginning
of the Kaliyuga was a New Moon day. Also, at the begin-
ning of the Kali, the Mean Sun being at the zero-point
of the zodiac, the negative longitude of the node only is
the longitude of the Sun with respect to the node. Hence
we have to add the above longitude of 5 —18 —33 to the
longitude obtained through the above formulation I, which
means 168°—33′ is to be added to 2x/3 (1 + 1/169) where x
is the elapsed number of lunations. Taking 168°—33′ as
nearly equal to 168°—40′, 2x/3 (1 + 1/169) + 168 2/3°
= 2x/3 (1 + 1/169) + 506/3 = 2x/3 (1 + 1/169) + 503/3 (1 + 1/169)
approximately = (2x + 503)/3 (1 + 1/169) as formulated.
Thus for x lunations, the longitude of the Sun with respect
to the node is x Rāśis + (2x + 503)/3 (1 + 1/169)°. If this
longitude falls short of 14°, we could except a lunar eclipse.
Latter half of verse 3 and verses 4, 5. Particularity
with respect to a solar eclipse.
Add half a Rāśi to the longitude previously obtained;
find out on which side the Sun lies, north or south; com-
pute the longitude of the Sun from the number of days
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