For centuries, French wine growers have prayed for the rains not to spoil their vineyards before grape harvest time. Now, a rising number are seeking help from the heavens in the shape of satellite technology in their search for the perfect vintage. With grape picking time fast approaching, dozens of wine domains in France – from the most prestigious Bordeaux chateaux to humbler vintners in the Languedoc and Roussillon – are eagerly awaiting information from the skies on exactly when and how to harvest their grapes. It is information some say would take "decades" to build up from the ground.