| gptkbp:instanceOf | gptkb:marine 
 | 
                        
                            
                                | gptkbp:composition | gptkb:granite 
 | 
                        
                            
                                | gptkbp:coordinates | 8.5°N 31.4°E 
 | 
                        
                            
                                | gptkbp:diameter | 873 km 
 | 
                        
                            
                                | gptkbp:discoveredBy | gptkb:Galileo_Galilei 
 | 
                        
                            
                                | gptkbp:eponymOf | tranquility 
 | 
                        
                            
                                | gptkbp:firstHumanLanding | gptkb:Apollo_11 
 | 
                        
                            
                                | gptkbp:firstHumanLandingAstronaut | gptkb:Buzz_Aldrin gptkb:Neil_Armstrong
 gptkb:Michael_Collins_(orbited_above)
 
 | 
                        
                            
                                | gptkbp:firstHumanLandingDate | July 20, 1969 
 | 
                        
                            
                                | gptkbp:locatedOn | gptkb:Moon 
 | 
                        
                            
                                | gptkbp:neighboringMunicipality | gptkb:Mare_Fecunditatis gptkb:Sinus_Amoris
 gptkb:Sinus_Asperitatis
 gptkb:Sinus_Concordiae
 gptkb:Sinus_Honoris
 gptkb:Mare_Serenitatis
 
 | 
                        
                            
                                | gptkbp:notableEvent | gptkb:Apollo_11_landing_site 
 | 
                        
                            
                                | gptkbp:notableFor | gptkb:Cayley_Formation gptkb:Crisium_Basin
 gptkb:Ranger_8_impact_site
 
 | 
                        
                            
                                | gptkbp:quadrant | northeastern quadrant of the Moon 
 | 
                        
                            
                                | gptkbp:scientificName | gptkb:Mare_Tranquillitatis 
 | 
                        
                            
                                | gptkbp:surface | 420,000 km² 
 | 
                        
                            
                                | gptkbp:形成时期 | gptkb:Imbrian_period 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Apollo_11_lunar_landing 
 | 
                        
                            
                                | gptkbp:bfsLayer | 4 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | Sea of Tranquility, Moon 
 |