You probably believe that the earth is spherical, but it is obvious that the earth is flat. Look around; where do you see the cu
rvature? One classmate suggests that if you call someone on the "other side" of the world by phone, he or she will answer and, for instance, it will be midnight there at the instant it is noon here. Another student reminds you of the picture taken of the spherical earth from the moon landing. Your teacher explains the ancient observation that when the sun was directly overhead on one day near the equator, a pole some hundreds of miles away to the north still cast a shadow. What is the best scientific basis for still considering that the earth is spherical?
