<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>At noon LST the sun is latitude angle from Zenith, the solar declination is 23.5 degrees and the sun on the solstices is above and below the equinox position by the declination. Everywhere on earth, however the day length varies and the sunset angle varies depending upon latitude. <BR></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Tom Elliot <tom@wagonmaker.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> RE-wrenches <re-wrenches@lists.re-wrenches.org><BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tue, February 22, 2011 8:16:54 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [RE-wrenches] Array tilt angle doesn't matter?<BR></FONT><BR>
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<DIV>Hmmm, I guess there could be a factor that enters into it due to the curvature of the earth but the difference between the tropics of Cancer and Capricorn, the extent of relative solar movement, is 47 degrees and that’s not about to change.</DIV>
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<DIV><B>From:</B> <A title=dave@independentpowerllc.com href="mailto:dave@independentpowerllc.com" rel=nofollow target=_blank ymailto="mailto:dave@independentpowerllc.com">Dave Palumbo</A> </DIV>
<DIV><B>Sent:</B> Tuesday, February 22, 2011 3:51 PM</DIV>
<DIV><B>To:</B> <A title=re-wrenches@lists.re-wrenches.org href="mailto:re-wrenches@lists.re-wrenches.org" rel=nofollow target=_blank ymailto="mailto:re-wrenches@lists.re-wrenches.org">'RE-wrenches'</A> </DIV>
<DIV><B>Subject:</B> Re: [RE-wrenches] Array tilt angle doesn't matter?</DIV></DIV></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Tom,</SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">This is coming from old memory, so I give this with a grain of salt, but I believe the <U>noontime sun angle</U> at my latitude (44.5) is about 78 degrees on June 21<SUP>st</SUP> and about 22 degrees on December 21st. That’s a difference of 56 degrees.</SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">David Palumbo</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Independent Power LLC </SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Hyde Park, VT 05655<B></B></SPAN></P>
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<P class=MsoNormal><B><SPAN style="FONT-FAMILY: 'sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN style="FONT-FAMILY: 'sans-serif'; FONT-SIZE: 10pt"> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Tom Elliot<BR><B>Sent:</B> Tuesday, February 22, 2011 7:46 PM<BR><B>To:</B> RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches] Array tilt angle doesn't matter?</SPAN></P></DIV></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: black">“The further north you go the wider the summer to winter sun angle.”</SPAN></P></DIV></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: black; FONT-SIZE: 10pt">Bob-O. Explain this one to me please. The difference between winter solstice and summer solstice sun angle is 47 degrees, everywhere on the planet, even in Hawaii. I suspect that in higher latitudes a lower sun angle means more atmosphere to affect insolation but the planet, last time I checked, is tilted the same everywhere.</SPAN><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: black"></SPAN></P></DIV></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: black; FONT-SIZE: 10pt">Tom</SPAN><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: black"></SPAN></P></DIV></DIV>
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