800 Years Ago, Japanese Astronomers Saw Strange Red Lights In The Northern Sky, Now Scientists Have Just Revealed What They Were

Red and green northern lights glowing above a dark forest under a starry night sky

Summary:

  • In 1204, a Japanese poet saw red lights in the north – 800 years later, scientists solve the mystery.

  • Fujiwara no Teika’s journal reveals a massive solar storm in medieval Japan, confirmed by a 2026 study.

  • Tree rings reveal an 800-year-old solar storm, warning of shorter cycles and potential dangers for astronauts today.

In 1204, a Japanese poet in Kyoto had seen in the north what no one could explain: three nights after night, successive red lights. And, now, 800 years later, the scientists have solved the riddle – and what they have discovered makes them believe that they have something to be on the lookout for in our sun.

A Poet Noticed Something Strange 

Red aurora borealis glowing above dark mountain silhouettes under a starry night sky.

Fujiwara no Teika tells of red lights in the north-eastern sky above Kyoto in his journal–no one in medieval Japan was aware of it.

It Was a Massive Solar Storm 

Green northern lights swirling across a starry night sky.

 

 

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On April 10, 2026, a study in the Proceedings of the Japan Academy confirmed it was indeed a strong solar storm and was able to unravel an 800-year-old riddle.

Tree Rings Cracked the Code 

Close-up of tree rings and cracks on a wooden log cross-section showing growth patterns.

The researchers further examined radioactive carbon in the rings of the trees (asunaro) in northern Japan by using the information of carbon -14 to determine past solar cycles to establish the date of the storm.

The Sun Ran a Shorter Cycle 

Solar images from 2010 to 2020 showing changes in sunspot activity and solar size over the years.

The then cycle of the sun was only seven or eight years, as compared with the eleven years we now have, and this translates to an excessive amount of solar action in comparison with that we are suffering.

Three Nights Were a Red Flag 

Green northern lights arching over a snowy landscape with silhouetted trees under a starry sky

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The auroras normally disappear after a 24-hour period. The three nights still ahead, Kyoto had in sight, were likely to bring a lot of solar flares – a message, not a performance, with which the sun was attempting to communicate.

Multiple Civilizations Witnessed It 

Ancient manuscripts, candles, quill, hourglass, and globe on a table with a castle and fiery sun under northern lights in the background.

 

The existence of Japanese, Chinese, Korean, Italian, French, and German records was used to determine the extreme solar activity that had taken place in the late 12 th and early 13 th centuries – a worldwide event that was hidden in the literature of that time.

A Separate Storm Was Found Too 

Ancient Chinese scholars observing a red aurora during the 1200-1201 AD great solar storm with a Carbon-14 spike graph inset.

Incidence of protons was not verified to have taken place on the Teika auroras. A solar storm was seen in 1200-1201 with a carbon-14 construction spike, and this coincided with reports in China of red aurora.

Sub-Extreme Storms Are the Real Danger

Graph showing reconstructed sunspot activity from 1255 to 1285 CE with peaks at 1261-1262, 1268-1269, and 1279-1280 CE events.

Professor Hiroko Miyahara concludes this work by discovering that there actually exist sub-extreme events of solar protons with 10-30 percent smaller than giant events, but with too frequent occurrence to be ignored, capable of causing devastating damage.

Astronauts Face Real Risk Today

Lightning striking near a rocket on a launch pad with smoke rising against a cloudy sky.

The sun will even be throwing a near-lightning speed towards the earth during the Apollo 16-17. Even the same thing that happened during any mission that a crew is involved in nowadays would have been catastrophic.

Ancient Poetry Is Now a Science Tool

The Sun emitting solar flares with Earth visible nearby in space.

The group is still researching the new trends of the sun. One of the most useful records, as far as the exploration of space weather by humanity is concerned, has been through the journal of one of the medieval poets.

 

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