Time Travel - How We Keep Time Across The Modern World (IET Ireland Local Network).
Dr Jacquline walker, provided an insightful account of how time keeping began, and how over the decades, measurements and observations of time have progressed, from movement of the sun around objects, through to the use of atomic clocks, and now why GPS still remains the choice of satellite coordination. It really comes down to the different methods of measuring the passing of a day. Not only sundials, we've had water clocks (passing of time through water), candles, and by the 2oth we moved to quartz clocks - whose higher frequency gave a better oscillation for accuracy. But time keeping is regional dependent and that now all systems use leap second, for example international atomic time does not use it, since it's introduction, there are 18 second leap differences between GPS and UTC time…
