I had a hard time getting past the "399" out about 43. I wanted to round it to "4". But these days I would rather memorize tau: 6.28318530717958647692528676

I had a hard time getting past the "399" out about 43. I wanted to round it to "4". But these days I would rather memorize tau: 6.28318530717958647692528676655900576839433879875021 It has that "00" at 27 digits in that must be got past.