time zone

time zone

a region of the globe that observes a uniform standard time for legal, commercial and social purposes. 

Increment

´1. the amount or degree by which something changes, especially : the amount of positive or negative change in the value of one or more of a set of variables

longitude

´2. the measurement east or west of the prime meridian.

UTC

the primary time standard by which the world regulates clocks and time.

spherical

shaped like a sphere

Prime Meridian

the meridian (a line of longitude) in a geographic

coordinate system at which longitude is defined to be 0°.

UTC