The sundial shows the time by indicating the movement of the sun as the shadow of the pointer moves. The equatorial sundial became popular in the Southern Song Dynasty(1127--1279) .

 
  • 風(fēng)行于南宋(公元1127--1279年)時(shí)期赤道日晷是一種古老的天文儀器,利用日照時(shí)指針投影的位置表示時(shí)間。
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