The Briefing

Monday 21 August

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21 August 2017

Episode 1508

30 minutes

A former terror chief tells us how Europe’s police forces are attempting to find the suspect of last week’s Barcelona attack and we ask whether Donald Trump will increase the number of US troops in Afghanistan. Plus: how the date and time of a solar eclipse is calculated.

21 August 2017

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Chapter 1

4 minutes

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Chapter 1

Maths and the solar eclipse

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Dr Chris Smith from the University of Cambridge tells us how scientists calculate the precise date and time of a solar eclipse.

4 minutes

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