Sky Map Online web app provides free & real-time interactive star map / sky charts for any location, time and viewpoint. It shows the night sky stars up to magnitude 12, planets, moon and DSO. It has zoom & pan, mobile & touch support, 3D Mode, user customization, grids, time travel, etc. It uses various catalogues: Tycho, BSC (for stars), Messier, NGC (for DSO, glaxies and nebulae)