अनुलोमाजतिनैस्थ: पस्यत्यचालम विलोमगं यध्वत |

अचलानी भानि तध्वत समपस्चिमागानी लंकायाम ||

Anulomagatirnausthah pasyatyachalam vilomagam yadvat |

achalani bhani tadvat samapaschimagani lankayam ||

"just as a person in a boat moving forward sees the stationary objects (on the bank) as moving backwards, the stationary stars are seen in Lanka (At the equator) as moving towards the west". 

source: Aryabhattiyam, Golapadah, chapter 4, Slokah 9, Aryabhatah (b.499)