The sidereal messenger of Galileo Galilei and a part of the preface to Kepler's Dioptrics containing the original account of Galileo's astronomical discoveries (1880)
om penetrating to the solid bodyof the Moon, if its thickness were greater; now, it isof greater thickness about the circumference of theMoon, greater, I mean, not in actual thickness, butwith reference to our sight-rays, which cut it obliquely;and so it may stop our vision, especially when it isin… … is surrounded by an enveloping atmosphere, deg.An eye at f penetrates to the middle parts of theMoon, as at a, through a thickness, da, of the at-mosphere ; but towards the extreme parts a mass ofatmosphere of greater depth, E B, shuts out its boun-dary from our sight. An argument in favour of this…
Astronomy
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