5-Astronomy-History-Invention
Huygens C
He lived 1629 to 1695 and saw Venus clouds, Saturn rings, and Jupiter red spot. He invented a light-wave theory using Huygen's principle and contributed to calculus. He improved clocks {spiral balance spring}.
Cassegrain N
He lived 1625 to 1712 and invented two-mirror reflector telescope.
Schmidt Be
He lived 1879 to 1935 and invented Schmidt telescope [1931].
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