![A lantern slideshows four overlapping illustrations of the Earth depicting its tilt at different time periods in the past, present and future. Dates represented are 13000 BC, 5544 BC, 1921 AD, 2296AD. Handwritten in blue ink at bottom left corner of plate is the text 'G53 CLW [illegible] Aug '22'.](https://publicseminar.org/wp-content/uploads/2026/02/Wragge_Earth.jpg)
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