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* Skygazing
Further reading
* The Stars: A New Way to See Them, by Hans Augusto Rey, ISBN 0-395-081211
* NightWatch: An Equinox Guide to Viewing the Universe, by Terence Dickinson, ISBN 0-920-656897 ...
" may seem to be a simple question, but it actually touches some of the deepest aspects of astronomy and skygazing because it deals with light.
Callisto was discovered along with Io, Europa and Ganymede in 1610 as astronomer Galileo Galilei was skygazing from his garden in Padua, Italy. He was surprised to see four small "stars" near Jupiter.
 See also: Sky, Light, Astronomy, Earth, Night
  
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