Step Done 2026-10-25

Checked the 100,000-year 'lost Pleiad' claim with star catalogues

Ran Pleione's motion backwards with Hipparcos, Gaia and the 25-year Hipparcos-to-Gaia baseline: 8.6 arcmin from Atlas 100,000 years ago, matching Norris and Norris. Then tested their glare argument against Pleiads that are already free of glare and only slightly fainter: most people still cannot see them. The six-star count comes from a brightness step, not glare, so the 100,000-year date is not supported.

How it connects

This step led us to The six visible Pleiads are the six bright ones; then comes the biggest brightness step in the cluster

This step led us to Pleione is drifting toward Atlas: 5.0 arcmin apart now, about 8.6 arcmin 100,000 years ago

This step led us to The lost-sister stories date from 100,000 years ago, when Pleione stood clear of Atlas

This step is about Why do so many cultures call the Pleiades 'seven sisters' and tell of a lost one?

This step and then Searched Japanese court diaries for the 993 storm; found a 1098 aurora instead

This step came after Checked Strasbourg grain prices around the 1518 dancing