Chankillo, a Peruvian "Stonehenge", has 13 towers in a straight line. No-one knows why. Now, Amelia Sparavigna at the Politecnico di Torino in Italy ... show[s] that the first tower lines up with sunrise on 21 June and the last tower lines up with the sunrise on 21 December ...[and] the shadows point north for half the year and south for the other half. What's more, when there are no shadows the sun is at its zenith.... [T]his would have been important information for a farming community, which would need to know when to plant seasonal crops.... However, many questions...
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