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jan 1, 1890 - Reflectors were recognized

Description:

40 inches was close to the maximum feasible aperture for refracting telescopes. If telescopes with significantly larger apertures were to be built, they would have to be reflecting telescopes.

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Technology timeline of astronomy

ByHunter
13 Feb 2020
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Date:

jan 1, 1890
Now
~ 135 years ago
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