It then says &quot;The Earth does in fact orbit the sun. In the strictest sense, however, it doesn’t.&quot;<p>It concludes by saying the Earth orbits where the Solar System&#x27;s barycenter was ~8 minutes ago. Note though that in the strictest sense, the concept of &quot;barycenter&quot; is ill-defined when one starts including light cones.<p>BTW, it ends with &quot;it propagates at roughly the speed of light&quot;. As best as we can tell, it&#x27;s at exactly the speed of light.