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| CONTENTS |
 Telling Time With the
Sun The sundial is
the oldest known device for the measurement of
time. It is based on the fact that the shadow of
an object will move from one side of the object
to the other as the sun moves from east to west
during the day. |
 Time
Zones were created to help railroads
create and keep more accurate schedules. In 1884,
the Earth was divided into 24 time zones, each 15
degrees of longitude in width, with the longitude
of Greenwich, England, being designated as the
"Prime Meridian." |
 Daylight Saving
Time is attained by forwarding the
clock one hour. In the United States, Canada, and
some other nations, Daylight Saving Time runs
from the second Sunday in March through to the
first Sunday in November, with the start and stop
times officially being 2 A.M. |
 The
International Date
Line is an imaginary line set at
180º longitude. When someone crosses the line
traveling to the west, one day is added -- that
is, Sunday on the east side of the line becomes
Monday as one crosses westward. |
 An Equinox
is either of two days of the year
when the Sun is directly above the Equator. At
these times, the days and nights are of nearly
equal length everywhere on Earth. |
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