Surya Siddhanta
प्रसादात् कस्यचिद् भूयः प्रादुर् भवति कामतः। कालसम्साधनार्थाय तथा यन्त्राणि साधयेत्॥
- Favor, again revealed to some one or other, at his pleasure. So also, one should construct instruments (yantra) in order to the ascertainment of time.
english translation