30 dic 1610 año - Galileo uses/Invents "SpyGlass"
Descripción:
What galileo called a spyglass was actually his design of the Refracting telescope<How A Refractor Works>
"Light enters a refracting telescope through a lens at the upper end, which focuses the light near the bottom of the telescope. An eyepiece then magnifies the image so that it can be viewed by the eye, or a detector like a photographic plate can be placed at the focus."
(Astronomy Text)
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fecha:
30 dic 1610 año
Ahora mismo
~ 415 years ago