Mexico City is 99.133333 degrees west of the Prime Meridian
The Prime Meridian is defined as the origin of longitude. The longitude of every point on it is zero.
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.
Shanghai, China is approximately 121 degrees east of the Prime Meridian, which is the internationally recognized marker of 0 degrees longitude.
!80 degrees east of Greenwich and then one crosses over to West Longitude
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 is located at 0 degrees longitude.
Morocco
The Prime Meridian is an imaginary semicircle that joins the Earth's north and south poles. As such, it's roughly 12,400 miles long, and extends through a range of 180 degrees of latitude. The longitude of every point on the Prime Meridian is zero.
New Zealand ranges in longitude between roughly 166.47° East to 178.55° East. Longitude is measured from the Prime Meridian, so those are the angles if you start at the Prime Meridian and travel eastward. Traveling westward from the Prime Meridian, the corresponding angles are 181.45° and 193.53° .
It is the meridian that goes through the Greenwich observatory in London - meridian zero. All other meridians are calculated from this prime meridian, i.e., so-and-so many degrees east or west (of the prime meridian).
Latitude