<div dir="ltr"><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr"><br>Subject: a fantasy of spin<br><br></div><br><div dir="ltr"><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000">"Yes, your Holiness, I will try to explain my ideas through two stories:</div><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000">Suppose a lord wanted to know, for no apparent reason, what the geometric center of Italy is. The problem is that on the North, <span class="gmail_default" style="font-family:"comic sans ms",sans-serif;font-size:large;color:rgb(0,0,0)">North</span>East and <span class="gmail_default" style="font-family:"comic sans ms",sans-serif;font-size:large;color:rgb(0,0,0)">North</span>West the borders are uncertain, and do we include Sardinia and Sicily etc? No. So choosing which borders to use is entirely arbitrary. We calculate several different centers based on different borders. Best to pick one that is near a big city (preferably near the lord if that is possible). </div><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000">Now consider the solar system. Your Holiness has declared that the Earth is the center. Then the planets and their motions are determined. The problem is that the geometry to do that is enormously complicated. If, by pure arbitrariness, we consider the Sun to be the center, then the geometry is far easier. Conversion from that to the Earth-centered geometry can be done.</div><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000">So the Sun being the center is just an arbitrary way of thinking to make the geometry easier. No one is saying, like in the case of the center of Italy, that one version is true and the others false. Earth as the center is perfectly valid, as you have ruled."</div><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000">Now what if we could go back in time and present Galileo these stories to tell to the Pope? Might they have worked to save him? Who knows? bill w</div><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div></div>
</div></div>