1 sept. 400 av. J.-C. - 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.
Ajouté au bande de temps:
Date:
1 sept. 400 av. J.-C.
Maintenaint
~ Il y a 2426 ans