astroengine writes "The stars are not static points in the sky; they move over time. That means the constellations are shifting too. With the help of NASA astronomer Robert Hurt, five famous constellations are visualized 50,000 years in the future."
I've never been canoeing before, but I imagine there must be just a few simple heuristics you have to remember... Yes, don't fall out, and don't hit rocks.