Dies Saturni - Saturn's Day

Satan's Day, Day of the Flies

Bath Day (Norse)

Shabbat (Norse / Hebraic)

Sabbath (Day of Purification)

The word Satan means devious, because the planet Saturn follows an irregular orbit to the rest of the planets.(it has it's own path)
Satan is known as "God of the snakes" from these strange paths. Another East Norse name for snake is Draco, or Dragon.