Yes, in your own reference frame you are stationary. So by definition all observers are at the same speed in their own reference frame, namely zero. What I wa

Yes, in your own reference frame you are stationary. So by definition all observers are at the same speed in their own reference frame, namely zero. What I was trying to say is that the velocity of the Earth relative to the Milky Way's SMBH is small compared to the speed of light.