William Herschel showed that variations in the brightness of the sun were causing climate change, but hardly anyone believed him.
In 1782, astronomer William Herschel set himself to examine a theory that the brightness of stars varied over time. There was no agreed classification for brightness, and no comprehensive record of observations, but it all had to do with a question that to Herschel was of the very first importance: whether the sun’s brightness also varies, and whether this has had any effect on earth’s climate.