| 
                                    
                                        gptkbp:instanceOf
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:instrumental
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:category
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:scientific_instrument
                                        
                                         
                                    
                                        
                                            
                                            navigation instruments
                                        
                                        
                                         
                                    
                                        
                                            
                                            astronomical instruments
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:component
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:armillary_sphere
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:depicts
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:bar
                                        
                                         
                                    
                                        
                                            gptkb:celestial_sphere
                                        
                                         
                                    
                                        
                                            
                                            stars
                                        
                                        
                                         
                                    
                                        
                                            
                                            ecliptic
                                        
                                        
                                         
                                    
                                        
                                            
                                            azimuth
                                        
                                        
                                         
                                    
                                        
                                            
                                            horizon
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:displayedAt
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:British_Museum
                                        
                                         
                                    
                                        
                                            gptkb:Museum_of_the_History_of_Science,_Oxford
                                        
                                         
                                    
                                        
                                            gptkb:Deutsches_Museum
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:etymology
                                    
                                 | 
                                
                                    
                                        
                                            
                                            from Greek 'astrolabos'
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasPart
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:rule
                                        
                                         
                                    
                                        
                                            
                                            mother
                                        
                                        
                                         
                                    
                                        
                                            
                                            plate
                                        
                                        
                                         
                                    
                                        
                                            
                                            alidade
                                        
                                        
                                         
                                    
                                        
                                            
                                            rete
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:inventedBy
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:ancient_Greece
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:languageOfOrigin
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Greek
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:material
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:metal
                                        
                                         
                                    
                                        
                                            gptkb:wood
                                        
                                         
                                    
                                        
                                            
                                            brass
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:notableUser
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Abd_al-Rahman_al-Sufi
                                        
                                         
                                    
                                        
                                            gptkb:Geoffrey_Chaucer
                                        
                                         
                                    
                                        
                                            gptkb:Hipparchus
                                        
                                         
                                    
                                        
                                            gptkb:Ptolemy
                                        
                                         
                                    
                                        
                                            gptkb:Al-Biruni
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:period
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Renaissance
                                        
                                         
                                    
                                        
                                            
                                            medieval period
                                        
                                        
                                         
                                    
                                        
                                            
                                            ancient period
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:relatedTo
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:sextant
                                        
                                         
                                    
                                        
                                            
                                            quadrant
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:replacedBy
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:sextant
                                        
                                         
                                    
                                        
                                            gptkb:octant
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:usedBy
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:astronomer
                                        
                                         
                                    
                                        
                                            
                                            navigators
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:usedFor
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:navigation
                                        
                                         
                                    
                                        
                                            
                                            timekeeping
                                        
                                        
                                         
                                    
                                        
                                            
                                            astronomical measurements
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:bfsParent
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Christopher_Clavius
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:bfsLayer
                                    
                                 | 
                                
                                    
                                        
                                            
                                            6
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        https://www.w3.org/2000/01/rdf-schema#label
                                    
                                 | 
                                
                                    
                                        
                                            
                                            Astrolabium
                                        
                                        
                                         
                                    
                                 |