Abrams SC-1, Technical Manual

Page: 17 / 39

OPERATION
That
is, by
setting clocks at
12
o'clock noon when
it
is
11
o'clock
by
standard time. Sunrise and sunset can
be
made to
come
one
hour
later
by the clock.
This
time may
be
called
"Daylight
Saving
Time", "Wartime",
or
"Fast Time",
and
is usually
adopted
during
the summer months.
(2)
The first
step
in
changing
from
local watch time
to
local
apparent time (sun time) is
to change the local watch time to
standard time. Determine
from military
or
civil
sources tin
time
at
which local clocks are
set
and
adjust
the watch
used
with the sun compass
to
standard time.
d.
Mean
Solar
Time.
(I)
The standard system of time is based on mean solar time.
The real sun has an apparent motion around the earth which
due to
the travel of the earth along
its
orbit,
is
non-uniform
from d:iy to day.
Ordinary
time
pieces
are not able to correct
MEAN SUN
.SLAR
T/M£
S1ANDARD
TIME
\2
00
I
00
CROSS
SECTION
OF
EARTH
FIUUBI
5
—
Comparison of Mean Solar Time
and
Standard Time.
9