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( Naked eye)
The naked eye is a figure of speech referring to human visual perception that is unaided by enhancing equipment, such as a telescope or binocular. (It, therefore, does not exclude the use of smaller scale aids such as glasses.) The term is often used in astronomy when referring to events that can be viewed by the general public, such as astronomical conjunctions, passage of comets or meteor showers. Sky lore and various tests demonstrate an impressive wealth of phenomena that can be seen with the unaided eye. The basic accuracies of human eyes are Visual perception allows a person to gain much information about his or her environment Normally the naked eye can see stars with an apparent magnitude up to +6m; angular resolution of the naked eye is about 1' however, some people have a sharper vision than that. There is anecdotal evidence that people had seen the Galilean moons of Jupiter before telescopes were invented. Of similar magnitude, Uranus and Vesta had most probably been seen but could not be recognised as planets because they appear so small even at maximum brightness that their motion could not be detected. Uranus, when discovered in 1781, was the first planet discovered using technology (a telescope) rather than being spotted by the naked eye.
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