The cache is not at the posted coordinates. These coordinates should place you in the center of the solar calendar. Walk to the stone that describes the structure you are in ("As a place of reflection, study, and celebration..."). This stone will be your starting point. From this point, you will need to project 435 feet 350*. If you did it correctly, you should find yourself next to a large tree.
If you don't know how to project waypoints, you can probably find the cache by continuing past the stone, northerly, for a distance of 435 feet. You will stay in the grass the whole way; no need to cross the street.
Good luck. Happy caching!
Congrats to RedRock! and Team BSCC for FTF!