指南 · 3 pieces
The parts that need explaining.
站里其他内容都是算出来的视图。这三篇是读者问得最多的：空间站到底什么时候看得见、怎么读一份总在变的发射计划、以及「天文暮光」到底是什么意思。
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10/29 How to see the 空间站 tonight — and why the pass times never repeat 空间站亮到肉眼可见，但只有在对的那个晚上。过境长什么样、先往哪看、为什么时间每天都在挪。 → 10/29 计划发射, window, T-0: how to read a launch schedule without guessing Why '计划发射' is a constraint rather than a promise, what a launch window actually constrains, and why so many launch dates are still TBD a month out. → 10/29 曙暮光解释：天空什么时候才真的够黑 Civil, nautical and astronomical twilight are not poetry — they are specific angles of the Sun 地平线下 the horizon, and they decide what you can see tonight. →
Tonight's plan
把读到的用起来：你的日落、暗窗与观测目标。