天再旦




天再旦，是古代天文學家記錄的一種罕見的天文現象，意思是同一天接連出現兩次天亮的情況。通常是由於清晨五點到七點的日全食所引起的天文奇觀[1]，第一次天亮時，天色又逐漸暗去，接著又迎接第二次天亮。最早在《诗经》裡就有天再旦的記載，《竹书纪年》記載過：“懿王元年，天再旦於郑，……”，指的是周懿王元年丑正四月丁亥朔，公元前899年4月21日发生的日食，在陝西華縣一帶可見到這個奇景。有學者認為所謂“日妖宵出”可能也是“天再旦”或“天再昏”的日食现象，可用來斷定《墨子·非攻下》記載“禹伐三苗”的正確日期。


对同一地点，“天再旦”现象出现的機率是千年一遇[2]。1997年3月9日，中国新疆北部在天亮之际發生所謂「天再旦」的日全食，由60位观测者从18个不同地点親身體驗這種現象。



參見



  • 夏商周斷代工程

  • 仲康日食



文內注釋





  1. ^ 刘次沅 周晓陆. “懿王元年天再旦于郑”考证. 《自然科学史研究》1999年 第1期 7 页 48-54页.  “天再旦”日食说，最早为刘朝阳(1944)指出


  2. ^ 刘次沅. 天再旦日食的根据与计算——对Keenan质疑的注释. 《陕西天文台台刊》2002年 第1期 5 页 70-73页. 








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