I think you mean, :why does the orbit of satellites, etc. look like a sine wave? Well, every orbit around the earth looks like a circular (or elliptical ring) whose center (or focus) is at the center of the earth. An orbit exactly above the equator is one such orbit, but any orbit can be tilted as long as the center (or focus) stays at the earth's center and the whole orbit is flat like a disk. On various maps this makes the orbit look like a wave, but on a globe it stays a flat circle (or ellipse).
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