1054 supernova
Calibration case. The Crab Nebula. Its near absence from European records remains a small puzzle.
How it connects
This mystery we read it in
Stephenson and Green 2002, Historical Supernovae and their Remnants
This mystery has this clue
Crab Nebula
This mystery has this clue
California sequoia and Finnish pine: radiocarbon rise around 1054 to 1055 at both sites
This mystery has this hunch or step
The 1054 supernova, not the Sun, made the carbon-14 rise of 1053 to 1055
This mystery has this clue
Guest star near Tianguan, 1054, visible by day 23 days