Surya Siddhanta
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