Abstract
“E. W. P.” may see the phenomenon he describes any sunshiny morning or bright moonlight night, when the dew is heavy on the grass. The halo being caused by reflection at a small angle of the sun or moonlight from the wet surfaces of the blades of grass, enhanced by contrast with the dark shadow (and having nothing to do with moist air), its brightness would no doubt be increased by the foreshortening and consequent apparent compression of the reflecting surfaces on the slope. The neighbourhood of a high hedge would diminish it by lessening radiation, and the consequent cooling of the grass and deposition of dew upon it.
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S., B. A Shadow and a Halo. Nature 38, 589 (1888). https://doi.org/10.1038/038589b0
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DOI: https://doi.org/10.1038/038589b0
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