Bhagavatapurana 5.21.9

5.21.9

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yatrodeti tasya ha samāna-sūtra-nipāte nimlocati yatra kvacana syandenābhitapati tasya haiṣa samāna-sūtra-nipāte prasvāpayati tatra gataṃ na paśyanti ye taṃ samanupaśyeran //

9. The Sun always sets at a point which is equi-distant from the point at which he appears to rise (i.e., every twelve hours lighting the same segment of the orbit). He sends the world to sleep when at that point which is diametrically opposed to the point where he shines so as to produce sweat (by his heat): and those that now see him do not see him when he is at the other point.