One of several historical Chinese astronomical instruments on the roof of the Beijing Ancient Observatory in Beijing, China, an astronomical observatory that dates from the 1400s. The sextant (1673) was designed to measure angular distance between any two stars less than 60 degrees apart, as well as angular diameters of the sun and moon. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Williamson, Mark |
Taille de l’image : | 3381 px × 5169 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |