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Blind tracking:

The accuracy of the telescope blind tracking is dependent on the position of the sky. The auto guiding system updates the corrections in a look up table, hence the blind tracking is much better at most used zenith distances and hour angles than, say, close to the horizon.

Examples of blind tracking

zenith distance
hour angle tracking error
arc second per minute
date comment
14 0 0.17 30.9.2004 average of 30 minutes
of tracking
70 8 0.6 7.4.2004 Biggest jump in three minutes
during 23 minutes of tracking
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