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Using speed measurements of the gas at different distances from the Galactic center, the Sun appears to be cruising along at 200 kilometers per second and it takes 240 million years to complete the grand circuit around the Galaxy. This speed is an absolute speed.
In addition, planets farther from the Sun move more slowly. Pluto, for example, goes about 40 times as far in its trip around the Sun as we do. It takes Pluto 250 years to travel once around, so its average speed is 40/250 or 16% of Earth's speed around the Sun. The Moonâs motion changes the fastest of any body we can see.