There was a rare event recently, and I missed it, and it won't occur again for something like eighteen years. If you missed it too, you can work on this cache instead. Hopefully it won't take you eighteen years to solve it.
Special Notes about the 2015 Puzzle Challenge: To be considered for Fastest Solver points, you must verify your solution with Certitude. Finders will receive Top Finder points when submitting Found It logs to the cache page. All "point" scoring is arbitrary, subject to change, at the discretion of the cache owner, and probably completely meaningless (unless you just want to be announced sooner at the celebration party on Sunday, December 13th, 2015, and even that might not happen in the right order). The real challenge is just to see whether you can solve all of these caches by the end of the year. To maintain fairness, hints should not be offered by the cache owner or other solvers until the fifteenth of the month.
Special Notes about this month's cache: Would have been straightforward, except for a couple of twists with the numbers. Cache difficulty rating assumed that you didn't use the hints below. The difficulty should be significantly easier with the hints. See the note in red above if you solved this puzzle before October 23, 2016.
You can validate your puzzle solution with certitude.