Surya Siddhanta
भूमेर् उपर्युपर्यूर्ध्वाः किम् उत्सेधाः किम् अन्तराः। ग्रहर्क्षकक्षाः किम्मात्राः स्थिताः केन क्रमेण ताः॥
The orbits of the planets and stars, uplifted from the earth one above another—what are their heights? what their intervals? what their dimensions? and what the order in which they are fixed?
english translation