Over the centuries there have been numerous volcanic eruptions that darkened the sky, with devastating results. No one knows when the next volcanic eruption will occur. Furthermore, in so many places of the world people suffer the effects of gloomy weather.
12 The fourth angel blew his trumpet, and a third of the sun was struck, and a third of the moon, and a third of the stars, so that a third of their light might be darkened, and a third of the day might be kept from shining, and likewise a third of the night.