"日晷"是个多义词，它可以指日晷仪,日晷（大型雕塑）。
日晷的对应物是水钟，用来测量夜间的时间。
The sundial's counterpart, the water clock, was designed to measure temporal hours at night.
为了在白天追踪时间，发明家发明了日晷，它通过太阳阴影的长度或方向来指示时间。
In order to track temporal hours during the day, inventors created sundials, which indicate time by the length or direction of the sun's shadow.
日晷在晚上或阴天不起作用！
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