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

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1°-40' minus 0-3'052"-15"' approximately. For x days x ✕
1 2/3° = 5/3 x° = 10 x° / 6 which gives the first part. Also 3'-52"-
15"' = 929° / 14400 = 1 / (15+) 1 / (1+) 1 / (1+) 1 / 464 of which a very ap-
proximate convergent is 2/31 = 10/155 ie for x days 10x° / 155. Hence
the position is given by 10 x° / 6 - 10 x° / 155 + Dhruvaka.
Verses 20. The position of Saturn is given by 2x' / 5 +
2x" / 5 + Dhruvaka = Saturn's position.
Comm. The mean daily motion of Saturn is
0-2-0-22-51.
For x days 2x' + x ✕ 0"-22"'-51"". The latter part
is 137" / 360 approximately = 1 / (2+) 1 / (1+) 1 / (1+) 1 / (1+) 1 / 2 of which a near
covergent 2/5 so that for x days, we have 2x' + 2x" / 5

• Dhruvaka position of Saturn.
  Verses 20 contd. To find the position of the apogee of
  Moon.
  The Ahargaṇa divided successively by 10 and 88 and
  added gives the degrees to be added to the Dhruvaka of
  the Apogee of the Moon to obtain its position.
  Comm. The mean daily motion of the apogee of the
  Moon is 0-6-40-53-56. At the rate of 6' per day, in x
  days the number of degrees covered is x / 10 ; the remainder
  0-0-40-53-56 = 4601° / 405000 = 1 / (88+) 1 / 41 of which a very
  approximate convergent is 1/88. Hence the position is given