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

220
Verses 71 to 75. Obtaining what are called Sukṣma-
nakṣatras.
The computation of the nakṣatras done as pres-
cribed before, is only approximate. Now I shall give
the method of obtaining what are called Sukṣma-
nakṣatras as prescribed by the Ṛiṣis that are required to
note auspicious occasions regarding marriages, journeys
etc. people who knew about it, told that the six stars
Viśākha, Punarvasu, Rohiṇī, and the three Uttaras or
Uttaraphālgunī, Uttarāṣādhā, Uttarabhadrā have the
duration of one and half stars ie. 3/2 × 790′ — 35″ =
1185′ — 52″. The six stars Āslesha, Ārdrā, Swāti,
Bharaṇī, Jyeshṭhā and Śatabhishak have half the duration
of a star ie. 395′ — 17″. The remaining 15 alone have
one nakṣatra duration ie. 790′ — 35″. A star's duration
is the mean daily motion of the Moon ie. 790′ — 35″. The
sum total of all the above 27 stars being subtracted from
360°, give the duration of the star what is called Abhijit
which occurs after Uttarāṣādha and before Śravaṇa. To
obtain the star in which a planet is situated, convert its
longitude in minutes of arc and substract the durations
of the stars from Aświni as many as could be substracted .
The number of stars whose durations are thus substracted
are deemed to have elapsed. The remainder is called the
gata or elapsed portion of the current star and the
difference of this gata and the duration of the current
nakṣatra is called the Ēṣya, ie. unelapsed portion. To
obtain the elapsed time or the unelapsed time of the
current star the gata or the ēṣya is to be multiplied by
60, and divided by the daily motion of the planet
concerned the result being in nādīs.
Comm. One line in the verse 72 is evidently missing
which should name Rohiṇī and the three Uttaras. We
are able to know them from Bhāskara's commentary
as well as from Brahmagupta and Śrīpati. In the course
of the commentary Bhāskara reiterates what was stated