水木牛逼，链接不知道触发什么关键字无法发出来，你照着下面文字搜NASA链接吧

The other thing that I'll explain to you how it worked, and it's a little interesting, is you've seen this picture where the lunar module lifts off and the camera follows it. Well, on 15, the motor burned out and we couldn't do that. On 16, the rover was not parked in the right place, so consequently we missed it.

Now, the way that worked was this. Harley Weyer, who worked for me, sat down and figured what the trajectory would be and where the lunar rover would be each second as it moved out and what your settings would go to. That picture you see was taken without looking at it at all. There was no watching it and doing anything with that picture. As the crew counted down, that's a [Apollo] 17 picture you see, as [Eugene A.] Cernan counted down and he knew he had to park in the right place because I was going to kill him, he didn't—and Gene and I are good friends, he'll tell you that—I actually sent the first command at liftoff minus three seconds. And each command was scripted, and all I was doing was looking at a clock, sending commands. I was not looking at the television. I really didn't see it until it was over with and played back. Those were pre-set commands that were just punched out via time. That's the way it was followed. That's the way it followed it.

On that same mission we tried to track it back in. I don't know whether you know that or not. You know, the lunar module crashed back in. There was a scientist who wanted to see it coming back in, and then they were going to look on the seismometer, whatever you call it, and get that data and so on. But everything that was figured out or whatever, we never saw it. But that's the way that was done, but it wasn't done by looking at the camera, at the picture at all. It was all done via time.
【 在 sosei 的大作中提到: 】
: 插旗可以慢慢插
: 你说这镜头高速追踪火箭发射是遥控的，呵呵，
: 地月光速通讯也得2秒多延迟，咋实时遥控，你说

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