This was not due to a lack of observations; during the 17th century, Giovanni Domenico Cassini carried out a systematic program of solar observations at the Observatoire de Paris, thanks to the astronomers Jean Picard and Philippe de La Hire.
Philippe Starck | Louis Philippe II, Duke of Orléans | Philippe II, Duke of Orléans | Philippe Parreno | Philippe Pétain | Philippe Herreweghe | Louis Philippe I | Philippe Pinel | Jean-Philippe Rameau | Philippe Leclerc de Hauteclocque | Philippe I, Duke of Orléans | Philippe Quinault | The Hire | Spenser: For Hire | Philippe Gilbert | Philippe Entremont | Philippe Beaussant | Philippe Léotard | Philippe Jaroussky | Philippe Douste-Blazy | Philippe d'Orléans | Philippe de Rigaud Vaudreuil | Philippe C. Schmitter | Philippe Boesmans | Philippe Bercovici | Jean-Philippe Collard | Prince Ferdinand Philippe, Duke of Orléans | Prince Ferdinand Philippe | Prince Charles Philippe, Duke of Anjou | Philippe Troussier |