Convergent Sunbeams

Abstract

I CAN add to the correspondence on the above subject in NATURE of February 19 and March 26 by reporting that I have observed the phenomenon on numerous occasions at Diyatalawa, a village at an altitude of 4,000 ft. on the eastern side of the central hills of Ceylon. The western horizon about eight miles away is the edge of a block of rough mountainous country with many peaks of about 7,000 ft. altitude (including the well-known Adam's Peak). During the clear weather of spring and summer, I frequently observed the shadows converging on the eastern horizon at sunset, and I used to wonder if they could be produced by prominent peaks as well as by clouds.