我们中的一些人用地图都迷路，一只鸟怎么能靠太阳导航呢？
How could a bird navigate by the Sun when some of us lose our way with road maps?
在晴日里，特别是在夏天，海员们能够利用正午头顶上的太阳导航。
On a clear day during the summer the sailors could use the sun at midday to navigate by.
例如，如果一只信鸽要用它的太阳罗盘进行导航，它必须根据日光/黑暗的循环所提供的线索正确设置时间。
For instance, if a homing pigeon is to navigate with its Sun compass, its clock must be properly set by cues provided by the daylight/darkness cycle.
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