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Polar
alignment and star alignment is affected by time. Setting
the time correctly is very important to the performance
of the ETX/Autostar telescope system. I always want
to set the time prcisely in the Autostar. I found this
clock when I was shopping in a electronics store. I
am very impressed that this clock will update with an
atomic clock serveral time a date. It is samll enough
to fit in my telescope hardcase. The LCD display even
glow in the dark.
Why
is the exact time important for precision Autostar GOTO
There are 1440 (24 x 60) minutes in a day while the
earth rotates 360 degree. That means the earth rotates
0.25 degree each minute. The field of view of a 26mm
eyepiece on ETX-90EC is 1.1 degrees. If the telescope
is not tracking the target object, it will go out of
view in 4.4 (1.1/0.25) minutes.. Every one minutes error
in the Autostar time, the target object would be off
by seconds or 0.25 degree. If the time is in error by
4 minutes and that is 1 degree. There shouldn’t
be any doubt that if you do not set the Autostar time
to the exact time, Polar alignment and star alignment
may fail. The telescope is not going to point to the
exact direction of your target object either. Remember,
half a degree here, quarter a degree there, you’ll
miss the target. Precision time is one of the factor
that affects Polar alignment, star alignment and Autostar
GOTO and is easily available. You need a precision time
source!
The
Clock That Sets Itself and synchronize with U.S. Atomic
Clock!
Built-in
radio receiver automatically synchronizes with U.S.
atomic clock to set its time, day and date. It adjusts
easily to the four U.S. time zones with he press of
on button, and automatically switches to Daylight saving
time. Using is internal antenna it activates daily to
seek the time signal from he U.S. Atomic clock, the
most accurate timepiece in the world, operate by the
U.S. Commerce Department in Boulder, CO
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