geostationary orbit
noun [ C ] physics specialized uk/dʒiː.əʊˌsteɪ.ʃən.ər.i ˈɔː.bɪt/ us/dʒiː.oʊˌsteɪ.ʃən.ər.i ˈɔːr.bɪt/
（同步卫星的）（地球）同步轨道;（对地）静止轨道（太空中，围绕某一物体而运行的轨道，人造卫星因为和地球运转速度一致，其在地球表面的运转轨迹保持不变）
an orbit (= path travelled around an object in space) in which a satellite always remains over the same place on the earth's surface because it moves at the same speed as the earth turns