Next came three flights to test rendezvous between the manned spacecraft and the unmanned lunar landing craft in Earth orbit, culminating with the crew transferring from one to the other.

• 后来的三次是测试载人飞船与绕地飞行的不载人登月飞船的会合，计划的高潮是宇航员从一个飞船转移到另一个飞船。