Figure 2-2 -- Standard time zone chart.
Coordinated Universal Time
The unit of time that you will be working with is Coordinated Universal Time (UTC).
Because UTC is based on scientific computations instead of the rate of rotation and
revolution of earth, the increased accuracy has enhanced air navigation.
As a general rule, the standard time zone in any particular position on earth can be
found simply by dividing its longitude by 15. When the remainder of this division is less
than 7 1/2°, the quotient represents the number of the zone; if greater than 7 1/2°, the
location is the next zone away from the Greenwich meridian. When there is no
remainder, the location lies exactly on the central meridian of a time zone. The sign of
the zone is determined by the hemisphere in which the position is located. In the