so maybe the 24 hour day is slowing down, but we can t measure it? yes, ma shg, maybe in dinos it is 18 hours in modern time slowed down. so anything that i have to worry about or plan for? well, the practical effect is on telecommunications. the practical effect is on the satellites that are orbiting at g geostation orbits and the earth has sped up a little bit. it means that the earth will slide out underneath them a little bit. it is remarkable that sat nav as we say in london or gps we say in north america is remarkable that those things depend on special relativity. without understanding relativity, you would not get the right answer with those things, and relativity depends on time, so the practical effect is that it will have a tiny evident with the telecommunications industry has to compensate for it. it is amazing.