----------------------------------- nobody 07 Dec 2015 19:13 ----------------------------------- @OvidiuDanut: Vezi ca ai acolo mai multe pagini despre duble (si nu numai, cele de optica sunt foarte bune). Double Star Astronomy • A Double Star PrimerTraining the Binary EyeDouble Star DatasetsOrbital & Dynamical ElementsDouble Star ColorDouble Star Distance & SeparationA Gallery of Multiple StarsDouble Star AstronomyA Visual Double Star Campaign - PowerPoint presentation (4.3 Mb) given at the 2013 Maui International Double Star Conference.