Polar Alignment and Star Alignment
Meade ETX-Autostar with an Atomic Precision Clock
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, the Polar alignment and star alignment may fail.
The telescope is not going to point to the exact direction of your target
half a degree here, quarter a degree there, you’ll miss the target.
Precision time is one of the factor that affects Autostar GOTO and is
easily available. You need a precision time source!
Clock That Sets Itself and synchronize with U.S. Atomic Clock!
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.
LCD display show time, date and day of week
Map display indicates user-selected U.S. time zone.
icon shows signal strength of internal receiver.
from English, French and Spanish Displays
Blue HiGlo illumination for nighttime convenience.