Sambapurana 20.52

20.52

praṇāti devānamṛtena sūryaḥ somaṃ suṣumneṇa vivardhayitvā
śukle tu pūrṇe divasakrameṇa taṃ kṛṣṇayanto vivudhāḥ pibanti

Stationed in the solar disc, Ketu constantly moves. / The diameter of Bhāskara is nine thousand yojanas;