Celestron 31041 Manuel d'instruction - Page 10

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4.
To find astronomical objects, you will now mainly use the right ascension axis as the polar
alignment virtually eliminates needed adjustments in the declination axis.
To track objects continuously, adjustments will be made with the right ascension cable.
When using the telescope, all objects in the sky will slowly drift out of the field of view unless you
manually make corrections with the right ascension cable.
5.
The above method of polar alignment is adequate for casual observing. More precise methods of
polar alignment are available and most astronomy texts or telescope books describe the
procedures.
6.
If you look at the North Star after this polar alignment procedure, your declination setting circle
(#23) should read 90° (the actual is 89.2°).
C.

Using the Setting Circles

Setting Circles are dials (or gauges) for right ascension and declination that allow you to locate celestial
objects easily from their coordinates as listed in a star chart or atlas.
1. The declination setting circle is scaled in degrees and the right ascension setting circle is incremented
in minutes. The circles will get you close to your target but not directly on it. Also, the accuracy of
your polar alignment will affect how accurate your setting circles read.
2.
The declination setting circle is factory set and should not need any adjustment if it reads accurately.
3.
The right ascension setting circle (#25) must be aligned. Choose a bright and easy to find star in a star
chart and note the coordinates (right ascension and declination). Find the star in the Star Pointer and
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