Astronomy Picture of the Day 每日一天文图 ; 每日天文图 ; 每天换天文图壁纸 ; 每日天文一图
以上来源于: WordNet
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。
The Mayan civilization, based in modern day Mexico and Central America, reached its height from 300 AD to 900 AD and had a talent for astronomy.
玛雅文化以现代的墨西哥和中美洲为基础，在公元300至公元900年间达到顶峰，具有非凡的天文智慧。
This is done in astronomy, with the help of the Julian day.
天文学上就是借助儒略日来算的。
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