A REALLY long time ago. One of the first celestial events consistently recorded. You don’t even need a telescope and filters. Just punch a pin hole in a sheet of paper and project the image on another. Ever do this to watch and eclipse. Works for sunspots too, but don’t try it now, ‘cause THERE AREN’T ANY :)
helps if u know who Rahmstorf is. it’s as if he knows what’s coming down. he’s had a big influence on Greta:
15 May: NoTricksZone: Climate Alarmist Rahmstorf Quietly Concedes Models Are Crap, Running Way Too Hot
By P Gosselin
Stefan Rahmstorf on the IPCC modelling breakdown: Reason to breathe a sigh of relief, new climate models are far too sensitive.
By Die kalte Sonne
(Translated by P. Gosselin)
https://notrickszone.com/2020/05/15/climate-alarmist-rahmstorf-quietly-concedes-models-are-crap-running-way-too-hot/
the pity is a lot of the climate mob got what they wanted with the covid lockdowns.