How the time was set in the first clock/watch made by humans?I prefer to set my watch by viewing time displayed in the news channels of television. However, the watch of television is also required to be set when it is started first time. Nowadays we have smartphones which automatically pick the location or time zone during international travels and set the time accordingly.
However, I came across this amusing question in the social media as to how the time was set in the first clock/watch made by humans? How prior to development of mechanical clock, time used to be recorded?
Was it possible to know the time in numbers like 05.00 PM by using a sand clock?