From Piston A, how can I synchronously get a return value from Piston B?
My use case is a piston that detects all the national holidays and others where school is closed. Most are easy, but some are based on the lunar cycle.
So I have a piston that figures out the phase of the moon for a particular day. I pass in the date, but I don’t know how to return the moon phase to the calling piston.
PS. I plan on posting all the pistons involved when I am done.