Hayanaratna · by Balabhadra
Chapter 1 · Planets, Signs, Year Entry
ग्रहराशिस्वरूपवर्षप्रवेशाद्यानयनाधिकारः
ननु ग्रहानयनमार्षशास्त्रादेव कर्तुं युज्यते नतु मानुष्यात् ॥ तस्यायथार्थत्वादिति चेत्सत्यं । ग्रहानयनं मुनिकृतशास्त्रादेव कर्त्तुमुचितम् ॥ परन्तु तत्रापि कालवशेनान्तरं पतति ।
An objection: the planets should be found only from a rishi's work, not from a human work. For a human work is not true. If you say so, that is right. Finding the planets is proper only from a work made by the sages. But even there a difference comes in with time.
Simple meaning: 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.
विस्रंसनं विस्रस्तिः । शिथिलत्वमिति यावत् ॥
The word visrasti: it means slipping or getting loose.