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Published online by Cambridge University Press: 19 July 2016
The features of the astrolabe are that:
(1) a span of 6 hour of R.A. of star positions can be tied in a group of observation of 2 hours, all-night observation can cover more than half of the sky, and
(2) the declination system can be set up with high precision without the need of a precise circle (Li 1987).