[1/4/5/1] Case that the view point is on A.

First of all we set up two big spheres in front of the camera. The size of the spheres is the same as the size of the earth and the distance of the camera from the spheres is 0.1 x light second. The digital clock texture is mapped on each sphere. The left hand sphere goes forward and returns back to its original position by accelerating up to 0.9 light speed.

Now we compare the time progress of both clocks, and see that the time of the left hand sphere proceeds slower than the right hand.

The background is the image of a spiral galaxy. The clock at the left-lower corner of the CG movie shows the proper time of the camera.

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