orbital
adj
of an orbit (星體的或人造飛行物體的)軌道的; 勢力范圍的
a spacecraft's orbital distance from the earth 航天器的遠地軌道距離
an orbital motorway, ie round the outside of a city 外環高速公路. -- n road passing round the outside of a city (城市的)外環路
Take the London orbital. 走倫敦外環路.