Was Van Gogh's Starry Night based on a real night sky?

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South Korean researchers believe they have found a close match to the alignment of the swirling stars and moon featured in Vincent Van Gogh's The Starry Night from 22nd of July 1889. This date is disputed by the Van Gogh Museum in Amsterdam. Radio 4's World at One presenter Jonny Dymond hears more from Alexandra Loske, an art historian and curator of the Royal Pavilion in Brighton. Image credit: VCG Wilson/Corbis via Getty Images