Bhagavatapurana 5.24.2

5.24.2

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yad adas taraṇer maṇḍalaṃ pratapatas tad vistarato yojanāyutam ācakṣate dvādaśa-sahasraṃ somasya trayodaśa-sahasraṃ rāhor yaḥ parvaṇi tad-vyavadhāna-kṛd vairānubandhaḥ sūryā-candramasāv abhidhāvati //

2. The Sphere of the burning Sun which we see yonder is, they say, ten thousand yojanas in extent; the sphere of Soma 12 thousand yojanas, that of Rahu is 13 thousand, who cherishes enmity towards Surya and Chandra on account of the interruption caused by them and assails them on full-moon or new-moon days.