Hayanaratna · by Balabhadra
Chapter 1 · Planets, Signs, Year Entry
ग्रहराशिस्वरूपवर्षप्रवेशाद्यानयनाधिकारः
अथ ब्रह्मसौरार्यादिपक्षाणां सत्त्वात्कस्मिन् पक्षे ग्रहाः साध्या इत्युक्तं दामोदरपद्धतौ ॥यान्ति संसाधिताः खेटा येन दृग्गणितैक्यताम् ॥तेन पक्षेण ते कार्याः स्फुटास्तत्समयोद्भवा इति ॥
Now there are schools such as the Brahma, the Saura and the Arya. In which school should the planets be worked out? This is told in the Damodarapaddhati. With some school, the worked planets agree with what is seen in the sky. By that school they should be made true for that time.
Simple meaning: Which planet-maths school to use: the one whose planets match what is seen in the sky.
ननु ग्रहानयनमार्षशास्त्रादेव कर्तुं युज्यते नतु मानुष्यात् ॥ तस्यायथार्थत्वादिति चेत्सत्यं । ग्रहानयनं मुनिकृतशास्त्रादेव कर्त्तुमुचितम् ॥ परन्तु तत्रापि कालवशेनान्तरं पतति ।
Sages' works or human works: the sages' works are right, but over time a gap with the sky appears.
उक्तञ्च सूर्यसिद्धान्ते ॥
Surya Siddhanta: the science is the old one; only time has moved on through the ages.
वसिष्ठसिद्धांतेपि ॥
Vasishtha Siddhanta: in every age the Sun, Moon and planets drift from the old figures.