Silly HP-41C Question

[smp]

Hi all,

I am happily getting familiar with my newly acquired HP-41C prior to getting my 41CL when Monte has another batch. (I had an HP-41C way back in the day, but it fell into disuse and was regrettably sold off to a collector long ago.)

So, today I dug out my old copy of Practical Astronomy with Your Calculator, and made a brute force program to calculate the date of Easter. No efficiencies at all, and probably the most laughable RPN program ever, but I got it in and it works.

The curious thing for me is that when I say XEQ EASTER, the screen clears and the flying goose symbol appears, but it does not move at all for the few seconds it takes the calculator to go straight through the list of instructions.

This program is just a series of simple in-line calculations with STOs and RCLs, INTs and FRCs, + - * and /. No loops.

What makes the flying goose symbol move while a program is executing?

Thanks,
smp