Historical map showing the path (track) of the shadow caused by an annular eclipse, across England and France, on 1st April 1764. An annular eclipse is a solar eclipse in which the thin outer disk of the sun can be seen as a ring around the moon. The track stretches from Spain (bottom left corner) across the northwest of France and the southeastern-most part of England up to Norway (top right). The dark oval gives the size of the moon's shadow at a given time during the eclipse. Three insets (shaded circles) show the appearance of the sun as seen from London, Orleans and Boulogne.
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