John Graves
speaker
7 appearances
1 recordings
1 series
first heard Jan 2014
last heard Jan 2014
John Graves’s voice in public audio — every appearance, attributed to the second.
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Appearances
Did I just hear someone say that a nautical mile... I don't want to appear petty, but a sea mile... When I was navigating in the Merchant Navy, a nautical mile... Another nail in your coffin full of mistakes and assumptions.
Because of the shape of the Earth, because it's not a perfect sphere, because it's slightly flattened at the poles,
like a tangerine, the length of the nautical mile varies slightly depending on which latitude you're in, it being shortest at the equator.
and longest towards the poles.
Yes, but at the first International Extraordinary Hydrographic Conference in Monaco in 1929, it was recognised that these variations were not always very helpful, and that different countries had their own different standards.
And in 1929, it was agreed to fix the length of the nautical mile.
at exactly 1,852 metres.
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