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Fibonacci/Golden ratio = 1.618 Kilometres in 1 mile = 1.609
Conversion is off by less than 1%, not bad at all
Yeah, it's nice an mysterious the first moment you hear about this but all the romance is gone once you think about how it works.
By far the most complicated part is the fact that the ratio of successive terms in the Fibonacci sequence approaches a specific number (which happens to be the golden ratio, which happens to be close to the ratio of km/mi).
Great, now I have two charts to memorize.
You only have to memorize how the fibbonaci sequence works, which is just addind the previous 2 numbers together to get the next
But we only get one number to convert. We don't know what the previous number is in the sequence without a chart up to that number.
The starting numbers are 1 and 1.
You only have to memorize ...
and have a lot of computing power available.
That algorithm ain't running itself.
you're welcome