A century later, another Old Norse text, called "The King's Mirror", describes auroras over modern-day Greenland. Researchers set out to better understand the auroral zone and its movement over the last 3,000 years in an effort to predict how it might change in the future. The team published maps indicating how the auroral zone has moved over the last three millennia on Aug. 20 in the Journal of Space Weather and Space Climate. The next century, the auroral zone started moving away from Japan but settled over Greenland. The historical literature matches the paleomagnetism records, according to Kataoka.The researchers also found similar consistencies in witness accounts in the United Kingdom during the 18th century, matching how the auroral zone dipped over Europe.