"The only large[ celestial globe ] evidently surviving from antiquity is that in the Naples Archaeological Museum, held upon the shoulders of the statue of Atlas, known as the Farnese Atlas. The globe is marble, 65 cm in diameter, covered with constellations depicted in relief (no stars). The question of whose astronomy inspired the artist's celestial vision has long been investigated and debated...."
Ayn Rand's title and dialogue are topsy-turvy from a mythological standpoint: ""If you saw Atlas, [the giant who holds the world on his shoulders,] if you saw that he stood, blood running down his chest, his knees buckling, his arms trembling but still trying to hold the world aloft with he last of his strength, and the greater his effort the heavier the world bore down upon his shoulders--what would you tell him to do?""I...don't know. What...could he do? What would you tell him?""To shrug."
LESSON: If you intend to show off your smarts by referring to mythology, research your topic first, or else your name will suffer embarrassment in perpetuity. Published foot-in-mouth disease outlasts even mythology.
Please see http://www.jcf.orgJosephCampbell Foundation, one of the world's foremost experts on mythology and its relation to religious philosophy.
Also see Mythology for Dummies http://dummies.com .
Cosulting Random House Webster's Unabridged Dictionary, 2nd ed. 1998, the definition given for Atlas is: "1) Class. Myth., a titan, son of Iapetus and brother of Prometheus and Epimetheus condemned to support the sky on his shoulders: identified by the anceints with the Atlas Mountains." Atlas is the giant who supports the sky, not the world, so your point is correct. In the scene in Atlas Shrugged from which you are quoting, Francisco D'Anconia is explaining to Hank Reardon his relationship to the welfare of the society in which he lives and those who are destroying it. On earth, the producers of life-sustaining value are those who support human existence. Rand seeks to draw an analogy here and to do so she has tweaked the myth, probably because the term "world" has better dramatic effect than "sky." For your knowing, the second definition given is: "2) a person who supports a heavy burden; a mainstay." From this it may be concluded that the tweaking is slight indeed. Perhaps you should also raise your point wth map makers who call their work an "Atlas" and see if they think it is worth their time.
As far "showing off your smarts" is concerned, if you intend to denigrate the intellect of Ayn Rand, you're going to have to do alot better than this.