12
The prime meridian goes through London at Greenwich.
24 Hours. When you pass the international date line which is the meridian of 180 longitude, you add a day if going west or subtract a day going east.
The Prime Meridian is located at 0 degrees longitude and passes through the Royal Observatory in Greenwich, England. It serves as the starting point for measuring longitude and divides the Earth into the Eastern and Western Hemispheres.
The Prime Meridian is defined as the origin of longitude. The longitude of every point on it is zero.
Mexico City is 99.133333 degrees west of the Prime Meridian
The prime meridian (designated as zero) runs from pole to pole, passing through the Greenwich Observatory, London, England. Lines of longitude to the east of the prime meridian are so many degrees east, and to the west of the Prime Meridian are so many degrees west.
They're half-way around the Earth from each other, so that must be 12 hours.
Botswana occupies the whole range of longitudes from 20° to 29.3° East of the Prime meridian.
The prime meridian encircles the entire earth, which means it is the same length as the earth's circumference, which is 24,901.55 miles.
The Greenwhich meridian also Prime Meridian is 0 degrees longitude and International Date Line roughly follows the 180° longitude or antimeridian. The antimeridian is the meridian which is 180° east or west of the Prime Meridian.
The prime meridian encircles the entire earth, which means it is the same length as the earth's circumference, which is 24,901.55 miles.