Surya Siddhanta
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वस्त्रच्छन्नम् बहिस् चापि लोकालोकेन वेष्टितम् । अमृतस्रावयोगेन कालभ्रमणसाधनम्॥
As covered with a casing (vastra) and as left uncovered, it is the sphere surrounded by Lokaloka. By the application of water is made ascertainment of the revolution of time.
english translation
तुङ्गबीजसमायुक्तम् गोलयन्त्रम् प्रसाधयेत् । गोप्यम् एतत् प्रकाशोक्तम् सर्वगम्यम् भवेद् इह ॥
One may construct a sphere-instrument combined with quicksilver : this is a mystery ; if plainly described, it would be generally intelligible in the world.
english translation
तस्माद् गुरूपदेशेन रचयेद् गोलम् उत्तमम् । युगे युगे समुच्छिन्ना रचनेयम् विवस्वतः॥
Therefore, let the supreme sphere be constructed according to the instruction of the preceptor (guru). In each successive age (yuga), this construction, having become lost, is, by the Sun's . -
english translation
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
एकाकी योजयेद् बीजम् यन्त्रे विस्मयकारिणि। शङ्कुयष्टिधनुश्चक्रैश् छायायन्त्रैर् अनेकधा॥
When quite alone, one should apply quicksilver to the wonder-causing instrument. By the gnomon (shanku), staff (yashti), arc (dhanus), wheel (cakra), instruments for taking the shadow, of various kinds.
english translation