Prof Brian Cox visits Chankillo solar calendar in Peru

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Professor Brian Cox has visited a giant desert solar calendar in Peru in his quest to understand the nature of time in creating and ending the universe.

The 2,500-year-old solar calendar in Chankillo was built by a civilization of which very little is known.

Wonders of the Universe is broadcast on BBC Two at 2100 GMT on Sundays from 6 March or watch online via BBC iPlayer.

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