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The exact first date of use is unknown, but one of the earliest uses was by Plato in the 400s BC. The connection of phi to Pascal's triangle was made when Leonardo Fibonacci created his Fibonacci sequence.
Lots of places. If you count the leaves in a flower or factor each fibonacci number to the fibonacci number before it, artichokes, seeds, dragonflies, pianos, bones, phi, pascal's triangle and MUCH MUCH MORE!!!!!
Hindu studies of combinatorics but Pascal discoevered more uses for it. If you add up the diagonals of Pascal's triangle, the sums are the entries of the Fibonacci Sequence.
the bunnies :)
Decimal numbers were in use in Europe well before the time of Fibonacci so he would have "related" to them when he started to count!