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<DIV><FONT size=2 face=Arial>It can work if they have circular orbits that
are quite close together, so that Green orbits their star in 6/7 of a Blue
year. Green will go around the star slightly faster than Blue, so that
Blue is falling further and further behind. After 6 Blue years, Blue will
have made 6 orbits, while Green will have made 7 and caught up on Blue from
behind.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I don't know if two large planets with such similar
orbital radii would be stable, but anyway it would fit the conjunction
schedule, and Green would be a bit hotter than Blue (their temperatures would
also depend on atmospheric composition).</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>- Gerry Quinn</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
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style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=jack.smith.1946@gmail.com
href="mailto:jack.smith.1946@gmail.com">Jack Smith</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=urth@lists.urth.net
href="mailto:urth@lists.urth.net">The Urth Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, February 09, 2011 1:47
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: (urth) grumble at wolfe
comment made attached to guardianarticle</DIV>
<DIV><BR></DIV><SPAN
style="BORDER-COLLAPSE: collapse; FONT-FAMILY: arial, sans-serif; FONT-SIZE: 9px"
class=Apple-style-span>"BTW, is there a consensus on the exact relation of the
planets Blue and Green? Do they orbit one another as a single system, or do
they orbit the sun on opposite sides, as do Earth and Gor?"</SPAN>
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style="BORDER-COLLAPSE: collapse; FONT-FAMILY: arial, sans-serif; FONT-SIZE: 9px"
class=Apple-style-span><BR></SPAN></DIV>
<DIV><SPAN
style="BORDER-COLLAPSE: collapse; FONT-FAMILY: arial, sans-serif; FONT-SIZE: 9px"
class=Apple-style-span>They can't orbit each other or orbit on opposite sides
of the sun because Blue and Green are farther apart and then get closer
at conjunction. Conjunction occurs every 6 years (OBW, Ch 7), and Blue's
year seems to be about the same as a year on the Whorl.</SPAN></DIV>
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style="BORDER-COLLAPSE: collapse; FONT-FAMILY: arial, sans-serif; FONT-SIZE: 9px"
class=Apple-style-span><BR></SPAN></DIV>
<DIV><SPAN
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class=Apple-style-span>I'm not sure how Blue and Green move to produce this
conjunction. If they are about the same distance from the sun but in
different orbital planes, they could at times be closer or more distant but
conjunction would occur twice a year. Perhaps Blue's orbit is circular
and Green's is more eliptical, resulting in the 6 year interval, but I haven't
been able to figure how this would
work.<BR></SPAN><BR></DIV></BLOCKQUOTE></BODY></HTML>