She points out that this would have been important information for a farming community, which would need to know when to plant seasonal crops.
That's a useful interpretation. (In fact, Sparavigna has been using this software to re-analyse the role of the Sun in a number of ancient solar observatories round the world.)
However, many questions remain, not least of which is why there are 13 towers? Suggestions, if you have any, in the comments section please.
Ref: arxiv.org/abs/1208.3580: The Solar Towers Of Chankillo
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