A Green Sun

Abstract

I WAS looking, a few days ago, at three o'clock in the afternoon, towards the sun, which was shining in a clear sky. Exhaust-steam from an engine employed in the new Thames Tunnel works, and situated just below my window, was passing intermittently over his face. Many puffs had already crossed it, some partially, others completely obscuring the luminous disk, when presently, three puffs, following each other quickly, successively covered the sun, which then shone brightly through the steam with a vivid light-green colour. The effect was strikingly noticeable, and the green colour intense. I watched for twenty minutes, but in vain, for another “green sun,” and at 3.30 clouds came up.