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.

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。

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Sun Compass is a program to show the north direction from the sun or moon position.

太阳罗盘(指南针)是一个能依据太阳或月亮的位置指示北方的程序。

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Western Europeans had also developed and put into use the magnetic compass, which helped when clouds obliterated both the Sun and the stars.

西欧人也已经发明并且使用了磁罗盘，当云彩同时遮住了太阳和星星时，它就能起作用。

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