Your friend saw this resource on bethinking.org and thought you should see it:
Does Astronomy Reveal Joshua’s Long Day?
A popular story gives a salutary warning of the need to check our sources carefully and be careful in the arguments we use.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/truth/does-astronomy-reveal-joshuas-long-day
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bethinking.org is a collection of resources which aims to make sense of the big questions of life about God, Jesus and Christianity.