Brihat Samhita
अथ तु भुजगेन्द्ररूपः पुच्छेन मुखेन वा स गृह्णाति । मुखपुच्छान्तरसंस्थं स्थगयति कस्मान्न भगणार्धम् ॥ ५-०६ ॥
If being of the shape of a serpent he eclipses with his head or with his tail, how comes it that he does not hide one half of the heavens lying between his head and tail?
english translation
atha tu bhujagendrarUpaH pucchena mukhena vA sa gRhNAti । mukhapucchAntarasaMsthaM sthagayati kasmAnna bhagaNArdham ॥ 5-06 ॥
hk transliteration by Sanscript