New example: Geographical distance #531
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Compute the geographical distance between two points on
Earth's surface using Vincenty's formulae, which are accurate
to sub-millimeter precision.
This example uses the new
fixed_pointfunction from #530@irevoire FYI: This is something I wanted to do for a long time, but couldn't — due to the lack of local variables (take a look at
step_λin the example, which needs to be passed tofixed_point).