The names of the days of the week came to us from the mythological gods of Ancient Rome. It was the Romans who were the first to begin their days at midnight, while the ancient Babylonians began theirs at sunrise and the ancient Jews, at sunset.
Sunday was named because it was the day sacred to the sun.
Monday was named because it was sacred to the moon.
Tuesday was named after Tiw, a god of war.
Wednesday was named after Woden, the leader of the gods.
Thursday was named after Thor, the god of thunder.
Friday was named after Frigge, the wife of Woden.
Saturday was named after Saturn, the god of crops and harvest.