This section is from the book "Bepler's Handy Manual of Knowledge And Useful Infomation", by David Bepler. Also available from Amazon: Bepler's Handy Manual of Knowledge and Useful Information.
With the enormous increase of railway traveling the necessity arose for inventing some method of counting time which should avoid the complications arising from the use of local mean time, which varies with every mile of east or west travel.
Name Central Meridian Nearest Places
Pacific......120°=8h. w. from Greenwich.. 1 1/2° east of Sacramento
Mountain . ..105°=7h. w. from Greenwich. .Denver, Colorado
Central......90°=6h. w. from Greenwich. .St. Louis and New Orleans
Eastern......75°=5h. w. from Greenwich. .Between N. Y. and Phila.
Intercolonial.. 60°=4h. w. from Greenwich. .About 31/2° east of Halifax
The standard meridians are 15 degrees of longitude or just one hour in time apart.