Astronomical Tools
SDSS 9 Image retrieval form
SDSS Data Release 7
SDSS DAS Coordinate List Submission Form
Aladin Lite Sky Atlas
Wiki Sky Atlas
The NGC/IC Project
CALCULATOR for Magnitude Limits for CCD and Telescope
HST images
Hubble Legacy Archive
ESO Observational Raw Data Query Form
An Atlas of The Universe
NED Cosmology Calculators
NED Extragalactic Database
The IAC Morphological Catalog of Northern Galactic Planetary Nebulae (PNs)
Galaxy On Line Database Milano Network
General Catalogue of Variable Stars
The International Variable Star Index
VizieR astronomical catalogues and data tables
Cal Sky Solar System appearance
Digital Plate Archives of Hamburger Sternwarte
Light Pollution Map Atlas (2018-2015)
Interactive Map of Light Pollution (2012)
Interactive Map of Light Pollution (2006)
Maps of the naked eye stellar visibility
Maps of the total night sky brightness
SMOKA Science Archive
USNO Astronomical Applications Department

Amateur Astronomers I know
Massimo Cenedese
Massimo Bernardi
Lorenzo Comolli
Gianfranco Gallio
Giuseppe Passera
Rosario Pomillo
Lucio Tellini
Giancarlo Forno
Enrico Richetti
Stefano Pesci
Roberto Marinoni