“That's one small step for a man, one giant leap for mankind.”
-- Neil Armstrong, Sea of Tranquility, 02:56 UTC, 21 July, 1969.
仔细读了一遍
wiki上的相关页面 ，以及部分NASA的
记录 ，仿佛还能清晰地体会到当年人们的激动和欣喜。
太空时代已经开始了半个世纪。这段时间在人类的历史中只是极短的一瞬，然而人类在科学技术的各个领域取得了长足的进步。人们勇敢地探索各个未知的领域，不断拓展生存空间，改善生活条件。我们的世界和半个世纪前相比，发生了翻天覆地的变化。
从某种意义上说，人类文明还十分年轻，还在摇篮中成长。总有一天，人们会开始探索宇宙，将足迹延伸到更远的地方去。相信到那时，人们还会记得月球上的那一步，记得那巨大的飞跃。
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抽空写的，就不多发挥了……
贴一段着陆时候的记录：
102:45:45 Aldrin: ACA out of Detent.
102:45:46 Armstrong: Out of Detent. Auto.
[Armstrong, from a 1996 letter - "The Attitude Control Assembly [ACA] was the control stick. It had potentiometers or transducers or something similar to provide an output proportional to stick position. Output went to the LGC (LM Guidance Computer) to command the RCS jets to fire. 'Out of Detent' simply means the stick was moved away from its centered position. It was spring/detent centered like the turn signal control on your car."]
[Fjeld - "Because the Digital Autopilot (DAP) was in Attitude Hold, it was firing the jets like mad at touchdown to maintain the pre-touchdown attitude. By joggling the ACA, a new reference attitude was sent to the DAP. Since they weren't moving anymore, the new attitude needed no jet firing to maintain. Soon after, the DAP was cycled with the P68 landing confirmation program."]
102:45:47 Aldrin: Mode Control, both Auto. Descent Engine Command Override, Off. Engine Arm, Off. 413 is in.
['413' is an AGS address and has been a topic of considerable interest to Journal Contributors Marv Hein and Frank O'Brien. Frank supplied the following description.]
[O'Brien - "(The AGS is) a wonderful machine. If you have done any work on a computer that just has a switch register and display (such as an IMSAI, ALTAIR or one of my favorites, the KIM-1), you'd be comfortable with the AGS."]
["The way the AGS operated is that you had only an address and data display, 0-9 keypad, a Clear button, plus +/-, Enter and Readout. That's it. The ultimate in simple interfaces! How the AGS was operated was to press Clear, then a memory address. On a 5-octal character display, you got what was stored in that location. To change it, you typed a +/-, followed by 5 characters. Pressing Enter stored the value directly into memory. What you hear is the checklist item noted as: 413+10000. The key sequence is Clear, 413, Enter, +10000, Enter."]
["Address 413 contains the variable that indicates that the LM has landed - so any abort will be from the surface - which further tells the AGS to save the attitude information from its gyros. These gyros were 'strap-down' types, which means that they had a fixed orientation with respect to the LM body. They also had a nasty habit of drifting quite a bit. So, as soon as they landed, the AGS was to 'lock in', if you will, the attitude the LM was in. If the PGNS died - and it was the PGNS that oriented and re-aligned the AGS - at least they would have some approximate attitude information to abort with."]
102:45:57 Duke: We copy you down, Eagle.
102:45:58 Armstrong (on-board): Engine arm is off. (Pause) Houston, Tranquility Base here. The Eagle has landed.
102:46:06 Duke: (Momentarily tongue-tied) Roger, Twan...(correcting himself) Tranquility. We copy you on the ground. You got a bunch of guys about to turn blue. We're breathing again. Thanks a lot.
102:46:16 Aldrin: Thank you.
出处：
http://www.hq.nasa.gov/alsj/a11/a11.landing.html
