A brother & younger sister got chased by a tiger at night, and they climbed up a big tree. When the tiger found the way to get up there, the children prayed to god to rescue them from the danger. God responded to the prayer and let down a rope, and the children were pulled up to the sky. After seeing this, the tiger also prayed to god for a rope, and a rope came down. But, alas, it was a rotten one! The tiger, therefore, fell in the middle of the air and landed on a millet field. The brother went up into the sky and became the moon, and the sister, who was shy and was afraid to be alone at night, became the sun. (There are actually more to say about the story, but I only described the things which are related to the image!)