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Fun Fact
BuzzFeed published a report claiming that Tumblr was utilized as a distribution channel for Russian agents to influence American voting habits during the 2016 presidential election in Feb 2018.
LJS 64 is a book of diagrams, many with moving parts, designed to accompany the work Theoricae novae planetarum by 15th-century Austrian Georg von Peurbach, who is considered one of the first modern astronomers. He was particularly interested in simplifying the Ptolemic system (which places the Earth in the center of the solar system). The diagrams in the book demonstrate increasingly complex planetary motion.
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LJS 64 was recently featured in #CoffeeWithACodex, you can watch the complete 30 minute video here: