Related terms:
lens
hevelius
eyepiece
refractor
achromatic
aberration
telescope
objective
focal length
isaac newton
adaptive optics
johannes kepler
observatory
aperture synthesis
astronomical
newtonian telescope
refracting telescope
chromatic aberration
spherical aberration
Wikipedia sources:
Ellipse
Johannes Kepler
Optical telescope
Refracting telescope
History of the telescope
Context for words:
keplerian
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