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Book Review
Nature 420, 362 (28 November 2002) | doi:10.1038/420362b
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High noon at the meridian
Among the 5,000 scientific instruments at the National Maritime Museum at Greenwich in London, UK, is a remarkable collection of sundials and related instruments, ranging in origin from the Far East and Islamic countries to London itself. It includes dipleidoscopes, like the one shown here, which were used to provide an accurate time check at noon, when the Sun passed over the meridian of the observer.
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