On Thursday, February 15, 2018 at 11:15:21 PM UTC+11, banerjee...@gmail.com   
   wrote:   
   > On Friday, 19 January 2018 21:23:21 UTC+11, qri...@gmail.com  wrote:   
   > > Newton's Principia Book III Propositions 1 to 8   
   > >   
   > > In Propositions 1, 2, 3 and 8 Newton does not mention the mass of   
   > > solar objects but only the square of their distance from the sun   
   > > or from each other.   
   >   
   > As written in proposition 7, Newton does mention the mass of solar   
   > objects. To quote from proposition 7 given by you below:   
   >   
   > open quote:   
   > > Proposition VII   
   > > That there is a power of gravity tending to all bodies, proportional   
   > > to the several quantities of matter which they contain.   
   > end quote   
   >   
   > Mathematically that amounts to: force of gravity upon a body =   
   > proportional to (for all bodies in the universe(the sum of the masses of   
   > one individual body with one of the rest))   
      
   Sorry, I should have written above:   
   Mathematically that amounts to: force of gravity upon a body =   
   > proportional to (for all bodies in the universe(the sum of the masses of   
   > one individual body MULTIPLIED with one of the rest))   
      
   >   
   > The other propositions relating to distance make up the gravitational   
   > equation that is well known, that is   
      
   And again, the same correction as above:   
   >   
   > Force of gravity upon a body is proportional to (for all bodies in the   
   > universe( the sum of the masses of THAT individual body with one of the   
   > rest divided by the square of the distance between their centres))   
      
   Force of gravity upon a body is proportional to (for all bodies in the   
   > universe( the sum of the masses of THAT individual body MULTIPLIED with one   
   of the   
   > rest divided by the square of the distance between their centres))   
      
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