That ' s called " rigui, " a design in ancient china to mark time, using the movement of the pillar ' s shade under the sunshine.

那个叫「日晷」 ，是中国古代利用太阳投射的影子来测量时间的一种装置。

youdao

That ' s called " rigui, " a design in ancient china to mark time, using the movement of the pillar ' s shade under the sunshine.

那个叫「日晷」 ，是中国古代利用太阳投射的影子来测量时间的一种装置。

youdao