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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.
The average distance from the Sun to the Earth is 150 million kilometers which can be written as 150 x 10^6 Km. CME's can vary in speed. They can range from 200 km/s to 1000 km/s, although typically, most of them travel at about 424 km/s (Avg 1996-1998 speed St. Cyr et al., 2000).ne also has to take into account the fact that the Sun itself is rotating, about once every 25 days at the equator. Since the Earth is also revolving in the same direction, it makes it look like the Sun takes a little bit longer to rotate, about 27 days. This produces a doppler effect of up to 2 kilometers per second.