“The extremely violent nature of the eruption of Krakatoa on August 26th to the 27th, 1883, was known in England very shortly after it occurred, but it was not until a month later that the exceptional character of some of the attendant phenomena was reported. Blue and green suns were stated to have been seen in various tropical countries: Then came records of a peculiar haze; in November the extraordinary twilight glows in the British Isles commanded general attention; and their probable connection with Krakatoa was pointed out by various writers.”

—The eruption of Krakatoa and subsequent phenomena, a report by the Royal Society of London, edited by G.J. Symons, 1888.