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.
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JACKSON, J. Convergent Sunbeams. Nature 141, 1102 (1938). https://doi.org/10.1038/1411102c0
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DOI: https://doi.org/10.1038/1411102c0
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