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A sun is 1.193 inches according to Wikipedia's entry for Japanese units of measurement at http://en.wikipedia.org/wiki/Japanese_units_of_measurement. So 8.5 sun is 10.1405 inches. I'm no expert, but that seems to be a fairly standard tsuka length for a katana with a 2.45 shaku (29.2285 inch) blade, if that was your reason for asking ;-)

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16y ago

What else can I help you with?