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There are two axis in the eq. mount. One is the
R.A. (Right Ascension)
axis
as shown in fig. 28. This
means the telescope can rotate around this axis. The R.A. should point north to Polaris. Tracking is
made using the R.A. axis. To lock the rotation the locking R.A. knob should be used (fig. 29). The
second axis is the
Dec (Declination) axis
– fig. 30. To lock this axis use the Dec locking knob as shown
in figure 31.
6.1. What is tracking?
Star’s positions rotate, slowly but surely, in the night sky. This is caused by the Earth’s rotation. Every
24 hours the Earth make a complete turn. So does the night sky. This means that, when observing
through a telescope, the stars will move away from the field of view after a few seconds. This is even
more evident when using high power eyepieces. They go away quite easily from the field of view.
Use the Dec and R.A. handles to precise point the telescope. Make sure the axis are securely locked.
To keep a star in the centre of the field of view tracking is required. Tracking can be done manually
or by a motor. Manual tracking can be done using the tow Dec and R.A. handles. They allow small
Figure 28. R.A. Axis.
Figure 29. Locking the R.A. axis.
Figure 31. Locking the Dec. Axis.
Figure 30. Dec. Axis.
