Brihat Samhita
यदि मूर्तो भविचारी शिरो अथ वा भवति मण्डली राहुः । भगणार्धेन अन्तरितौ गृह्णाति कथं नियतचारः ॥ ५-०४ ॥
Now, if he has a body or be simply a head with a regular motion in the ecliptic, how comes it that he eclipses the sun and moon when they are 180° from him?
english translation
yadi mUrto bhavicArI ziro atha vA bhavati maNDalI rAhuH । bhagaNArdhena antaritau gRhNAti kathaM niyatacAraH ॥ 5-04 ॥
hk transliteration by Sanscript