The Author is grateful to all who contributed highlighting these personal educational/research pages with infographic material.
Credits go especially to the following persons and organisations:
Some small portions of real astronomic photos are used on these pages, curtesy of David Wittman, from Deep Lens Survey, National Optical Astronomy Observatory / AURA / NSF.
The General conditions are a fruit of consultations with Mme Av Nathalie Tissot, Etude de Mes Lucien, Marie et Nathalie Tissot, La Chaux-de-Fonds, Switzerland.