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<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"><url><loc>https://hudson.nu/2026/04/01/the-calvine-ufo-a-possible-natural-explanation/</loc><image:image><image:loc>https://hudson.nu/wp-content/uploads/2026/04/calvine-weather2.png</image:loc><image:title>calvine-weather2</image:title></image:image><image:image><image:loc>https://hudson.nu/wp-content/uploads/2026/04/calvine-weather1.png</image:loc><image:title>calvine-weather1</image:title></image:image><image:image><image:loc>https://hudson.nu/wp-content/uploads/2026/04/calvine_ufo_image_original_a4.jpg</image:loc><image:title>The Calvine UFO Photograph (the 'Lindsay' print)</image:title><image:caption>DETAIL - The only extant photograph of the Calvine UFO – a black and white copy print from the original colour image donated to Sheffield Hallam University Special Collections by its owner, Criag Lindsay, in June 2022.&#13;&#13;PROVINANCE - This photograph was reportedly captured on the moors above Calvine, close to Pitlochry, in Perth and Kinross, Scotland, UK on the 4th August 1990, by two young men who at the time were working in a local hotel believed to be FISHERS in Pitlochry. The photographers took a series of six photographs of an unknown object in the sky above them and after having their film developed, took the resulting images and told their story to the Glasgow Daily Record. The Daily Record produced this black and white copy print for the RAF press officer for Scotland Criag Lindsay, who they had contacted for comment. Upon receiving it Lindsay immediately produced three photocopies of the image in order to fax it to the Ministry of Defence in London. The MoD then obtained the original negatives from the Daily Record, studied them and produced a report and briefing for the Minister of Defence before returning them to the Daily Record. Criag Lindsay safely kept the copy he was given by the Daily Record for 32 years before revealing it to Dr David Clarke and ultimately donating it to Special Collections at Sheffield Hallam University on the condition that the image was made freely available on a not-for-profit basis jointly crediting him and the University.&#13;&#13;Prior to being deposited in the University Archive the original Lindsay print was photographed by Andrew Robinson, Senior Lecturer in Photography at Sheffield Hallam University who also undertook an in-depth analysis of the image – available here - https://shura.shu.ac.uk/34877/&#13; &#13;The image file produced is © ANDREW ROBINSON / SHEFFIELD HALLAM UNIVERSITY 2022.&#13;&#13;All medium and high-resolution copies of this image that are currently in circulation originate from the digital file produced by Andrew 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