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sep 1, 400 BC - cross staff

Description:

The cross-staff is an instrument used to measure angles and altitudes, consisting of a trigonometrically graduated staff and one or more perpendicular vanes moving over it.

Added to timeline:

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Byomar cardeanas
13 Nov 2017
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450

Date:

sep 1, 400 BC
Now
~ 2428 years ago
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