Though there have over the centuries been increases and decreases in the solar heat people felt on earth, there is no known time when the sun was so hot that people on earth were physically scorched. Then again, today’s concern with climate change (= global warming) instils people with fear so that they respond in a fashion consistent with Revelation 16:9.
8 The fourth angel poured out his bowl on the sun, and it was allowed to scorch people with fire.