名词
中文翻译：日晷
同义词：
['solar chronograph', 'solar timekeeper']
例句：
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1.The heliograph was used to measure the angle of the sun at noon.
日晷被用来测量中午太阳的角度。
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2. The heliograph was a crucial tool for navigation during the ancient Greeks.
日晷是古希腊时期导航的重要工具。
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3. The heliograph helped scientists to better understand the movement of the planets.
日晷帮助科学家更好地理解行星的运动。