This cache was hidden for my 2016 Picnic on the Brandywine. It has a code word for the poker run so if you are playing make sure you write it down.
This will take you to the Star-Gazers' Stone. You MUST use the listed parking! DO NOT try and drive to the waypoints as the area is by private property but they have allowed acces to the Stone by way of a very clearly marked trail. I stress again you must use the Marked Trail which is very easy to see with signs at every turn.
This is a field puzzle so bring some paper with you along with the pen that I already know you have so you can sign the log! You will need to visit the two listed waypoints to get what you need. I also listed them below.
Trees N39 56.286 W75 43.890
Sign N39 56.353 W75 43.946
At the trees you will need to count all the tall evergreens that are in the row. You will come up with a two digit number.
D= Subtract the 1st digit from the 2nd digit
At the sign waypoint you will need to find the sign and calculate the following letters.
A= How many dates are on the sign
B&C = Using the first date 1CB4
E= Using the last date 19E8
F=B
Cache is at N39 56.ABC W75 43 DEF
Checksum A+B+C+D+E+F = 29