| gptkbp:instanceOf | gptkb:castle 
 | 
                        
                            
                                | gptkbp:accuracy | up to 1 second in millions of years 
 | 
                        
                            
                                | gptkbp:component | gptkb:Coordinated_Universal_Time_(UTC) 
 | 
                        
                            
                                | gptkbp:definedSISecond | 1967 
 | 
                        
                            
                                | gptkbp:enables | precise synchronization time transfer
 frequency standards
 
 | 
                        
                            
                                | gptkbp:establishedIn | 1949 
 | 
                        
                            
                                | gptkbp:inventedBy | gptkb:Isidor_Rabi 
 | 
                        
                            
                                | gptkbp:maintainedBy | gptkb:National_Institute_of_Standards_and_Technology_(NIST) gptkb:International_Bureau_of_Weights_and_Measures_(BIPM)
 
 | 
                        
                            
                                | gptkbp:measures | gptkb:time_zone 
 | 
                        
                            
                                | gptkbp:mostCommonType | gptkb:cesium_atomic_clock 
 | 
                        
                            
                                | gptkbp:operates | measuring frequency of electromagnetic radiation 
 | 
                        
                            
                                | gptkbp:otherTypes | gptkb:hydrogen_maser gptkb:rubidium_atomic_clock
 optical lattice clock
 
 | 
                        
                            
                                | gptkbp:usedFor | space exploration relativity experiments
 testing fundamental physics
 
 | 
                        
                            
                                | gptkbp:usedIn | gptkb:GPS gptkb:astronomy
 gptkb:navigation
 telecommunications
 international time standards
 
 | 
                        
                            
                                | gptkbp:uses | atomic resonance 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Atomic_Physics gptkb:Rabi_oscillation
 gptkb:National_Watch_and_Clock_Museum
 gptkb:Ramsey_interferometry
 gptkb:Ramsey_method_of_separated_oscillatory_fields
 gptkb:gravitational_time_dilation
 
 | 
                        
                            
                                | gptkbp:bfsLayer | 5 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | atomic clocks 
 |