Astronomy: a diagram of the Earth's orbit around the Sun in a solar year showing the changing seasons. Coloured engraving by J. Emslie, 1851, after himself.

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Astronomy: a diagram of the Earth's orbit around the Sun in a solar year showing the changing seasons. Coloured engraving by J. Emslie, 1851, after himself. Public Domain Mark. Source: Wellcome Collection.