A coordinate error off by eight kilometers#
Early astronomical calculations of the eclipse's path seemed to conflict with the historical account, suggesting it should not have been visible from Qufu at all, SSBCrack reports. The researchers traced the mismatch to an error in ancient Qufu's geographic coordinates, which had placed the city about eight kilometers from its true location, according to SSBCrack. Correcting that error let the team accurately rebuild the eclipse and pull new data from it, SSBCrack reports.news.ssbcrack.com 1 source for this line, starting with news.ssbcrack.com
The eclipse was first recorded in the Spring and Autumn Annals, a chronicle compiled roughly 200 to 300 years after the event, which stated simply that the Sun was totally eclipsed, according to Science Daily and SSBCrack. A later addendum in the Hanshu, or Book of Han, written about seven centuries afterward, described the eclipsed Sun as completely yellow above and below, Science Daily reports.sciencedaily.com+1 2 sources for this line, starting with ScienceDaily
What the yellow addendum may describe#
Lead author Hisashi Hayakawa, an assistant professor at Nagoya University's Institute for Space-Earth Environmental Research and Institute for Advanced Research, said the Hanshu addendum has traditionally been associated with a record of the solar corona, the Sun's faint outer atmosphere visible to the naked eye only during a total eclipse. "If this is truly the case, it represents one of the earliest surviving written descriptions of the solar corona," Hayakawa told Science Daily.sciencedaily.com 1 source for this line, starting with ScienceDaily
Analysis of the corona's possible shape in the account suggests the Sun was returning to a more active phase after an extended period of unusually low activity, Science Daily and SSBCrack report. The findings were published in Astrophysical Journal Letters and offer potential independent support for earlier work that used radiocarbon data to determine past solar activity levels, according to Science Daily.sciencedaily.com+1 2 sources for this line, starting with ScienceDaily
Why China's old sky records matter#
BBC Sky at Night Magazine reports that Chinese astronomical record-keeping across dynasties has yielded exceptionally valuable documentation of eclipses throughout history, and that documentation from 709 BCE represents the oldest known written account of a total solar eclipse. The same outlet notes the eclipse gave researchers insight into the history of the Sun by letting them calculate how it would have looked from the Lu Duchy's court at the time.skyatnightmagazine.com 1 source for this line, starting with BBC Sky at Night Magazine
