==> physics/shoot.sun.s <==
You aim it at the horizon.  The sun is exactly in the place where it
appears to be.  It is true that the sun wasn't on the horizon 8 minutes
ago (the specific number is 2 degrees), when it emitted the light you
are now seeing.  However, "the sun wasn't on the horizon" doesn't mean
the sun moved; it means the horizon moved.