For an earthbound observer objects in the sky complete one revolution around the earth in 1 day. Proxima Centauri, which is the nearest star outside the Solar system, is about 4 light years away. On a geostationary view Alpha Centauri has a speed many times greater than c as the rim speed of an object moving in a circle is a product of the radius and angular speed. It is also possible on a geostatic view for objects such as comets to vary their speed from subluminal to superluminal and vice versa simply because the distance from the earth varies. Comets may have orbits which take them out to more than 1000 AU. Circumference of a circle radius 1000 AU is greater than one light day. In other words, a comet at such a distance is superluminal in a geostatic frame.
See Salters Horners Advanced Physics A2 Student Book, Oxford etc (Heinemann) 2001, pp 302 and 303
See
See Salters Horners Advanced Physics A2 Student Book, Oxford etc (Heinemann) 2001, pp 302 and 303
See