@zedgeist

True, but somebody could do a cool count-up "clock" like the "debt clock" that would count the stars that have heard our transmissions, so far.

Call the start 1926, though we had some largish transmitters earlier. By '26, I think they were all over the world, broadcasting every direction.

So call it 100ly, and get a count, then advance by 1ly/yr. The number of stars would go up as the cube of time.