Why is a book of maps called an Atlas?

The ancient Greeks told tales about giant beings called Titans. The Titans one fought with the Greek gods and lost. So, the gods punished the Titans. Atlas’s punishment was to hold the sky up on his shoulders. He held the sky up for years and years.One Titan was named Atlas.
Once, when Atlas was doing his “job”, Hercules came to him and asked him to find out some golden apples for him. Atlas agreed to help me, but asked to “keep” the sky untill Atlas returns.
Hercules was almost as strong as Atlas, but it was a hard work for him.
Soon, Atlas came back. He saw Hercules with the sky on his shoulders and he thought, “I could leave Hercules here and walk away. Then I would be free forever.”
Hercules realized what Atlas had in mind. So Hercules thought of a trick. “This sky is so uncomfortable!” he said. “Hold it up for a minute while I put a pad on my shoulders. Then I’ll hold it up again.” So Atlas took the sky from Hercules.
But then HErcules ran away, leaving Atlas with the “heavy sky”.
So, Atlas had to keep holding up the sky forever. In time, he turned into stone mountains — the Atlas Mountains in northwestern Africa. Even now, Atlas still seems to carry the sky on his shoulders.
About 500 years ago, Geradus Mercator made a book of maps. In the book, he told the story of Atlas. Ever since then, a book of maps has been called an atlas.
So, now you know how Atlas – the keeper of all the world – got its name.