Show 1 time stan standards ar a the earth turns on its axis abig every 24 hours rotating from west to east cast sun time Is taken from vie the time when the sun apparently crosses the meridian at a given place since this changes change as one goes east or west it has ben necessary to establish different standard tines times zones based on the merld meridians lans 73 75 00 90 and degrees west I 1 in this his country places within about degrees of each of these lines of 0 longitude take the time at these meridians as their standard no do matter what their local or sun time may be many cities adopted a daylight tor for the summer months advancing their clocks nn an hour so as to take advantage of 0 the early morning light and to save light and fuel in the eN evening ening the united states time zones running from east to west are arc eastern c central mountain and pacific the tha continental rit railroads adopted these s standards as early as hence the tc term railroad time detroit news |