Subject: Cassinis triangulation of distance Earth-Mars in 1672

Roemer used the A.U. for his measurement of Lightspeed. Where did he get 
it? I found the reference to Cassini in your Article about parallaxes. 
Since Earth and Mars are both constantly moving against each other, what 
was Cassinis baseline? I would like a sketch or diagram of the experiment.
(and the actual data itself??)One side and two angles means Cosinus 
Theorem?.Your article says "it was known that Jupiter is about 5 times as 
far as the Earth from the Sun" How was that known?? And Thanks!!!Paul

Re: Cassinis triangulation of distance Earth-Mars in 1672