File:Gate-Shadow (8209479892).jpg

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Gate-Shadow

Tinged with the sky’s ambient light, The lines are blue on chalky ground, Their penumbras like black opal.

Horizontals are molten, moulded To ruts in the road. Uprights elongate, Conform in proportion, submit:

Cotangent to the sun’s elevation. Diagonals converge: gunsights On the source. It blinds the mind,

Dazzles it with orbs and flares, tips Perception sideways. I baulk, recover, Step forward, open wide the gate.

Poem by Giles Watson, 2012. Shadows have a bluish tinge because of Rayleigh Scattering. The struts of the gate block the light of the sun, but they do not block the blue-coloured ambient light of the sky. The penumbra is the part of a shadow in which the light source is only partially occluded by an opaque object; it can be seen in the shadows in this photograph as a slightly fainter haze surrounding the darker umbra. The length of a shadow is proportional to the cotangent of the elevation angle of the sun.
Date
Source Gate-Shadow
Author Giles Watson from Oxfordshire, England
Camera location51° 34′ 05.95″ N, 1° 35′ 22.04″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
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This image was originally posted to Flickr by Giles Watson's poetry and prose at https://flickr.com/photos/29320962@N07/8209479892. It was reviewed on 15 May 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0.

15 May 2021

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Date/TimeThumbnailDimensionsUserComment
current10:28, 15 May 2021Thumbnail for version as of 10:28, 15 May 20214,288 × 3,216 (4.35 MB)Sentinel user (talk | contribs)Transferred from Flickr via #flickr2commons

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