Please elaborate and maybe I can make it happen :>
Viewing post in 25 Spinning planets [60 frames each] comments
Maybe I still need a bit more info :) Planets usually do not cast a shadow in space except on other celestial objects, also the planets are already shaded so that their bottom right parts are in shadow if you look closely. If you need them to cast a shadow on some plane below them, maybe just use some dark ellipse?