This article explains all the different time
scale utilized and how time can be synchronised globally.
Asking
somebody the time may be one of today’s most common questions but have you ever
wondered where the time on our watches comes from?
Accurate
clocks have only been around since the mid 17th century, before then,
time was completely subjective. People would use the celestial bodies as a time
reference such as noon (when the sun was highest) and midnight (when the moon
is at its highest) and also dawn and dusk. Often lengths of time were referred
to in comparison such as the time it would take a man to walk a mile.