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perception in an area of about 160° × 175°.
*Ability to see faint stars up to +8 magnitude under a perfectly dark sky.
*Photometry (brightness) to ±10% or 1% of intensity - in a range between night and day of 1:10,000,000,000.
*Symmetries of 10-20' (3-6 m per 1 km), see the measurements of Tycho Brahe.
*Interval estimations

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