The Notebooks of Leonardo Da Vinci Complete


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and, by means of a ray passing through a small hole into a dark  
chamber, detect its real size; and besides this, by means of the  
aqueous sphere calculate the size of the globe ...  
Here it will be shown, that when the sun is in the meridian of our  
hemisphere [Footnote 10: Antipodi orientali cogli occidentali. The  
word Antipodes does not here bear its literal sense, but--as we  
may infer from the simultaneous reference to inhabitants of the  
North and South-- is used as meaning men living at a distance of 90  
degrees from the zenith of the rational horizon of each observer.],  
the antipodes to the East and to the West, alike, and at the same  
time, see the sun mirrored in their waters; and the same is equally  
true of the arctic and antarctic poles, if indeed they are  
inhabited.  
How to prove that the earth is a planet (865-867).  
8
65.  
That the earth is a star.  
8
66.  
In your discourse you must prove that the earth is a star much like  
the moon, and the glory of our universe; and then you must treat of  
the size of various stars, according to the authors.  
707  


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