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Basic knowledge
Sidereal tracking speed
While the earth turns under the night sky, the stars seem to wander from east to west.
Thespeedwithwhichthestarsmovealongiscalled"siderealspeed".
Ifthetelescopeisalignedwiththecelestialpole(seepreviouschapter"Telescopemounts"
onpage 15),themotordriveof theMCXisdesignedsothatthe telescoperotatesat
sidereal speed. In this way it automatically tracks the stars. This tracking facilitates the
adjustment of objects and holds them - once adjusted - in the middle of the telescope
eyepiece.
Rotation speeds
The handheld computer offers a total of nine rotational speeds, which are directly
proportional to the sidereal speed. They have been designed so that the special functions
can be carried out accordingly. Press a number key to change the rotation speed. It then
appears on the display of the handheld computer for about two seconds.
The nine available speeds are as follows:
Number key 1 = 1x =  1x sidereal (0.25 arc minutes per second or 0.004°/sec)
Number key 2 = 2x =  2xsidereal(0.5arcminutespersecondor0.008°/sec)
Numberkey3= 8x=  8xsidereal(2arcminutespersecondor0,033°/sec
Numberkey4= 16x= 16xsidereal(4arcminutespersecondor0.067°/sec)
Numberkey5= 64x= 64xsidereal(16arcminutespersecondor0.27°/sec)
Numberkey6=128x= 32arcminutespersecondor0.5°/sec
Numberkey7=256x= 90arcminutespersecondor1.0°/sec
Numberkey8=512x= 180arcminutespersecondor2.0°/sec
Numberkey9=Max.= 768arcminutespersecondor3.0°/sec
Speeds 1, 2 or 3: Ideal for fine-tuning an object into the field of view of a higher
magnificationeyepiece,suchasa12mmor9mmeyepiece.
Speeds 4, 5 or 6: For placing an object in the center of a low or moderate magnification
eyepiece,suchasthestandardSuperPlössl26mm.
Speeds 7 or 8: Best suited for rough adjustment of an object.
Speed 9: This allows the telescope to move quickly from one place in the sky to another.
17


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