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SCIENTIFIC ACHIEVEMENTS.
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(C), while the other observer pointed to the other star through a sight at the end of a movable radius. Both observers employed
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/af/Tycho_Brahe_0359.png/450px-Tycho_Brahe_0359.png)
Sextans Trigonicus.
the same object-sight, a small cylinder (A) at the centre of the arc and perpendicular to the plane of the sextant. As the observers when measuring very small distances would