  In this paper we apply a Bayesian technique to determine the best fit of
stellar evolution models to find the main sequence turn off age and other
cluster parameters of four intermediate-age open clusters: NGC 2360, NGC 2477,
NGC 2660, and NGC 3960. Our algorithm utilizes a Markov chain Monte Carlo
technique to fit these various parameters, objectively finding the best-fit
isochrone for each cluster. The result is a high-precision isochrone fit. We
compare these results with the those of traditional "by-eye" isochrone fitting
methods. By applying this Bayesian technique to NGC 2360, NGC 2477, NGC 2660,
and NGC 3960, we determine the ages of these clusters to be 1.35 +/- 0.05, 1.02
+/- 0.02, 1.64 +/- 0.04, and 0.860 +/- 0.04 Gyr, respectively. The results of
this paper continue our effort to determine cluster ages to higher precision
than that offered by these traditional methods of isochrone fitting.
