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Re:求今天上海的E

Posted by Fanazhe at 2009-09-20 19:10:33
In Reply To:求今天上海的E Posted by:laisiwei at 2009-09-20 17:49:49 
> 我们的思路就是以观察者为中心，分别求出到太阳和月亮中心的向量，然后算出夹角
> 同时还算出太阳和月亮的视角。然后用两个圆相交情况的思路判断
> 
> 视角和 大于 夹角：看不到
> else
>     月亮的距离远：看不到
>     else 
>         视角差绝对值 大于 夹角：偏食
>         else 太阳视角大：环食
>              else 全食
> 
> 
> 请问这样的思路有问题么

总之，不要用eps才能过……
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