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The Ch'ing-yang event of 1490 (also Ch'ing-yang, Chi-ing-yang or Chíing-yang meteor shower) is a presumed meteor shower in the Qìngyáng (Ch'ing-Yang, ) then of the district of Shaanxi (陕西, now part of Gansu 甘肃 Province), in March or April 1490 CE,〔〔 with one source dating the event to April 4, 1490. If a meteor shower did occur, it may have been the result of the disintegration of an asteroid during an atmospheric entry air burst. A large number of deaths were recorded in historical Chinese accounts of the meteor shower, but have never been confirmed by researchers in the modern era. In the same year Asian astronomers coincidentally discovered comet C/1490 Y1, a possible progenitor of the Quadrantid meteor showers. Researchers have also noted the general proximity of the Ch'ing-yang event to the last major Australian tsunami which occurred approximately 1500 CE. == Meteor shower == At least three surviving Chinese historical records describe a shower during which "stones fell like rain", killing more than 10,000 people. At least one report of the event is found in the official History of the Ming Dynasty, and other journal records which describe the event are also generally considered reliable.〔 But the official Ming Dynasty history omits the number of casualties, which has been frequently either doubted or discounted by present-day researchers.〔〔 Due to the paucity of detailed information and the lack of surviving meteorites or other physical evidence, researchers have also been unable to definitively state the exact nature of the dramatic event,〔 even examining the possible occurrence of severe hail.〔 However Kevin Yau ''et al.'' of NASA's Jet Propulsion Laboratory did note several similarities of the Ch'ing-yang meteor fall to the Tunguska event, which would have destroyed a highly populous district.〔〔 One surviving account records:〔 One source of Chinese astronomical information of celestial events, the ''Zhongguo gudai tianxiang jilu zongji'' (Complete collection of records of celestial phenomena in ancient China) records ten works that discuss the March–April 1490 event,〔〔 including the official History of the Ming Dynasty. Additionally there are records of it in local gazettes and histories of the region.〔 The ''History of Ming'' work (the 明史, or Míng Shǐ) states only that there was a rain of uncountable stones of various sizes. The large objects were as big "as a goose egg, and the small ones were the size of the fruit of an aquatic plant". The date given was the third lunar month of 1490, which translates as March 21 to April 19, 1490.〔 Although the Ming Dynasty history did not record the number of deaths or injuries, other sources do. One semi-official document recorded that a provincial Shaanxi official reported there had been a rain of stones that weighed as much as 4–5 jin (市斤), down to 2–3 jin (modern jins being 605 grams). The number of deaths in this account was in the several tens of thousands.〔 The semi-official report and two others date the event to the second lunar month with one source dating the event as April 4, 1490, part of the 3rd lunar month.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1490 Ch'ing-yang event」の詳細全文を読む スポンサード リンク
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