addEventListener(Event.ENTER_FRAME,doOrbit)

function doOrbit(e){
	orbit.rotation+=1;
	for(var i=0; i<orbit.numChildren; i++){
		var planet = orbit.getChildAt(i);
		planet.rotation -=1;
	}
}

http://www.adamcoulombe.info/lab/as3/polkadot-orbit.html

simple way to make an orbiting effect in flash with as3

AS3 Orbiting Polkadots

flash

ActionScript 3