Honda ARX1500T3DX Owner's Manual page 69

Longitudes, also called meridians, are vertical
circles extended from the North Pole to the
South Pole. The zero degree longitude, which
passes through Greenwich, England, divides
the Earth into the Eastern and Western
hemispheres. The 180 degree longitude, half
way around the planet, is the international
date line.
LONGITUDE
0° longitude
(Greenwich, England)
North Pole
Western
Hemisphere
South Pole
Each longitude is 69 miles (111 km) wide
Each time zone equals 15° longitude
Introduction
180° longitude
(international date line)
Eastern
Hemisphere
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GPScape System