How we know the earth's shape
Explains that a globe is the best model to represent the shape of the earth. Discusses the change in man's ideas about the shape of the earth from flat, to curved, to round, to flattened and bulging, to pearshaped. Explains the value of rockets and satellites in helping us to learn more about the shape of the earth
Film, English, 1960
Film Associates of California, 1960