author
Parallax
1816–1884
Best known for writing under the pen name “Parallax,” this 19th-century English author became famous for Zetetic Astronomy: Earth Not a Globe, a work that helped shape later flat-earth writing. His career mixed lecturing, invention, and controversial ideas, making him a curious figure in Victorian popular science.
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About the author
Samuel Birley Rowbotham (1816–1884), who published as Parallax, was an English writer, inventor, and lecturer. He is chiefly remembered for Zetetic Astronomy: Earth Not a Globe, a book that began as a short pamphlet in 1849 and was later expanded into a longer work. Writing in a confident, argumentative style, he presented what he called a “zetetic” method based on direct observation.
Rowbotham worked in a Victorian world fascinated by science, reform, and public debate. Alongside his writing, he was also associated with utopian socialist circles, which adds another layer to his life beyond the book he is most known for today. Although his ideas about the shape of the Earth were rejected by mainstream science in his own time as well as later, his book remained influential among later flat-earth advocates.
For modern readers, Parallax is less important as a scientific authority than as a revealing historical voice. His work offers a glimpse into how scientific language, popular lecturing, and strong personal conviction could combine in the 19th century to create books that were provocative, memorable, and widely discussed.