(17BII, 19BII) Easter Sunday solver

[striegel]

This formula may only be useful for a short time to come, since the churches seem to be agreeing to a fixed date for Easter.

Still, the application of the Let and Get functions is instructive. I learned a lot by studying the technique employed here.

See too that the differences in Solver syntax here between HP LX palmtops and the 17BII and 19BII calculators is minor:

• LX'es use commas instead of colons
• the symbols for multiplication and division are "*" and "/" in the LX instead of "x" and "÷"