求解…为什么是冬至日,怎么看出是南半球的?直射点的经度怎么求的?
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![求解…为什么是冬至日,怎么看出是南半球的?直射点的经度怎么求的?](/uploads/image/z/8717934-30-4.jpg?t=%E6%B1%82%E8%A7%A3%E2%80%A6%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AF%E5%86%AC%E8%87%B3%E6%97%A5%2C%E6%80%8E%E4%B9%88%E7%9C%8B%E5%87%BA%E6%98%AF%E5%8D%97%E5%8D%8A%E7%90%83%E7%9A%84%3F%E7%9B%B4%E5%B0%84%E7%82%B9%E7%9A%84%E7%BB%8F%E5%BA%A6%E6%80%8E%E4%B9%88%E6%B1%82%E7%9A%84%3F)
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