On calculating longitudes
                                Date
                            
                            
                                17th century
                            
                            
                        
                            
                            
                            
                                Creator
                            
                            
                                Unknown, Artist
                            
                            
                        
                            
                            
                            
                                Object type
                            
                            
                            
                        
                            
                            
                            
                                Archive reference number
                            
                            
                            
                        
                            
                            
                            
                                Manuscript page number
                            
                            
                                p1
                            
                            
                        
                            
                            
                            
                                Material
                            
                            
                            
                        
                            
                            
                            
                                Dimensions
                            
                            
                                height (page): 294mm
width (page): 282mm
                            
                        
                            
                            
                            width (page): 282mm
                                Subject
                            
                            
                            
                        
                            
                            
                            
                                Description
                            
                            
                                Henry Oldenburg here comments on someone else's suggestions for calculating longitude on the basis of the sun and a star. 
Although the text mentions the Italian astronomer Giovanni Battista Riccioli (1598-1671), Oldenburg seems to imply that he is not directly commenting on his book Geographiae et hydrographiae reformatae (Bologna, 1661)
                            
                            
                        
                            
                            
                            Although the text mentions the Italian astronomer Giovanni Battista Riccioli (1598-1671), Oldenburg seems to imply that he is not directly commenting on his book Geographiae et hydrographiae reformatae (Bologna, 1661)
                                Related fellows
                            
                            
                                Henry Oldenburg (1612 - 1677, German) , Scientific correspondent
                            
                            
                        
                            
                            
                            
                                Associated place