rtomes: Of interest is something else that just came to mind. Have a look at the average rotational velocity of the inner planets relative to the Sun. They show clear 12 and 6 km/s multiples. Most are very close with only Venus off by 1 km/s. Also an analysis of nearby star radial velocities shows a slight tendency to more being at multiples of 12 km/s.

Nereid: What sources are you using, as inputs to your analysis?