Literal: let the sun rise over Antequera (a town in Andalusia).
2.
Spainparticularly Andalusiacolloquialinformal
Figurative: an emphatic formula meaning 'regardless of what happens' or 'come what may,' used to indicate determination to act despite possible consequences.
Examples:
ES: Que para una vez que alguien me trata con cariño, yo me lanzo y que salga el sol por Antequera.
EN: Since for once someone treats me with affection, I'll jump right in, come what may.