Course of the pendulum is changed by effect of the earth's rotation. However, the curvature of the locus is not visible to the human eye, because the pendulumn oscillates with much shorter cycle than the earth's rotation. So, its effect on the pendulum with a far longer cycle would be much clearer. But to make a pendulum with a cycle of one day, we would have to hang a pendulum from the moon let alone the dome of the Pantheon. Instead, let's use a rotating table in the laboratory, make the length of a day shorter and experiment with that. This photo is a shot taken of the locus of a pendulum on a rotating table with a camera that is also rotating