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Show new changes starting from 17:47, 18 August 2019
 

9 August 2019

  • (diff) (hist) . . Nm Telescopes‎; 04:52 . . (+1,005) . . Ana (Talk | contribs) (Created page with '== Basic geometry == Plate scale of a telescope is 1 radian in the sky (measured in arcsec) "seen" in the focal plane of the telescope at the focal length (measured in millimete…')
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