  I present here a measurement of pi as determined for the largest observable
circles. Intriguingly, the value of 16/5 asserted by the House of
Representatives of the State of Indiana in 1897 is still viable, although
strongly disfavored relative to 22/7, another popular value. The oft-used
`small-circle' value of 3 is ruled out at greater than 5\sigma. We discuss
connections with string theory, sterile neutrinos, and possibilities for (very
large) lower limits to the size of the Universe.
