The sun had risen over the earth when Lot came to Zoar. Then the Lord rained brimstone and fire on Sodom and Gomorrah from the Lord out of heaven,
Genesis 19:23-24 (NASB)
In the same way we learn that the plagues in Egypt point to God's triumph over specific Egyptian gods, there is a teaching that says that the inhabitants of the 5 cities of Sodom and Gomorrah worshipped the sun.
ויאיצו, in order that their destruction should take place at the very moment the sun, their great god, would come forth. (compare Berachot 7)
Sforno on Genesis 19:15