Experts say that according to traditional Chinese astronomy, the 5th day of the 5th month in lunar calendar is when the sun reaches its peak position in the year.
专家称，根据传统的中国天文学，农历5月5日，太阳在一年中达到最高点。
As an advanced and accurate calendar in the history of China, the Shoushi calendar also occupies a distinct position in the history of world astronomy.
作为中国历史上一部先进的、精确的历法，《授时历》在世界天文学史上也占有突出的位置。
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