SB 5.24.1
sri-suka uvaca
adhastat savitur yojanayute svarbhanur naksatravac caratity eke yo ’sav amaratvam grahatvam calabhata
bhagavad-anukampaya svayam asurapasadah saimhikeyo hy atad-arhas tasya tata janma karmani
coparistad vaksyamah.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sri Sukadeva Gosvami said: My dear King, some historians, the speakers of the Puranas, say that 10,000 yojanas [80,000 miles] below the sun is the planet known as Rahu, which moves like one of the stars. The presiding deity of that planet, who is the son of Simhika, is the most abominable of all asuras, but although he is completely unfit to assume the position of a demigod or planetary deity, he has achieved that position by the grace of the Supreme Personality of Godhead. Later I shall speak further about him.