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SB 5.24.1

śrī-śuka uvāca
adhastāt savitur yojanāyute svarbhānur nakṣatravac caratīty eke yo ’sāv amaratvaṁ grahatvaṁ cālabhata bhagavad-anukampayā svayam asurāpasadaḥ saiṁhikeyo hy atad-arhas tasya tāta janma karmāṇi copariṣṭād vakṣyāmaḥ.
Synonyms: 
śrī-śukaḥ uvāca — Śrī Śukadeva Gosvāmī said; adhastāt — below; savituḥ — the sun globe; yojana — a measurement equal to eight miles; ayute — ten thousand; svarbhānuḥ — the planet known as Rāhu; nakṣatra-vat — like one of the stars; carati — is rotating; iti — thus; eke — some who are learned in the Purāṇas; yaḥ — which; asau — that; amaratvam — a lifetime like those of the demigods; grahatvam — a position as one of the chief planets; ca — and; alabhata — obtained; bhagavat-anukampayā — by the compassion of the Supreme Personality of Godhead; svayam — personally; asura-apasadaḥ — the lowest of the asuras; saiṁhikeyaḥ — being the son of Siṁhikā; hi — indeed; a-tat-arhaḥ — not qualified for that position; tasya — his; tāta — O my dear King; janma — birth; karmāṇi — activities; ca — also; upariṣṭāt — later; vakṣyāmaḥ — I shall explain.
Translation: 
Śrī Śukadeva Gosvāmī said: My dear King, some historians, the speakers of the Purāṇas, say that 10,000 yojanas [80,000 miles] below the sun is the planet known as Rāhu, which moves like one of the stars. The presiding deity of that planet, who is the son of Siṁhikā, 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.