How did Aryabhatta explain the setting and rising of the sun?

He explained it as an optical illusion caused by the Earth rotating on its own axis toward the east.

Aryabhatta: First to Explain Earth's Rotation (2018 PYQ)

ID: ANC_HIS_PMPG_2018_74 Ref: Aryabhatiya by Aryabhatta

Who among the following was the first to explain that the rotation of the earth on its own axis accounts for the daily rising and setting of the sun?

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Correct Option: A

Aryabhatta was the first to explain that the daily rising and setting of the sun is caused by the Earth's rotation on its own axis. He recorded this scientific observation in his 5th-century work, the Aryabhatiya.