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This picture was taken standing on the Greenwich meridian looking North. The left half of the image is in the Western Hemisphere and the right is in the Eastern. The meridian passes straight through the middle, see this http://www.riddlerworld.co.uk/meridian/PG1400.htm for an alternate image with the meridian superimposed as a yellow line. The meridian cuts through two tall trees just south of the lane to Avery