[RE-wrenches] Array tilt angle doesn't matter?

[Darryl Thayer]

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.    





________________________________
From: Tom Elliot <tom at wagonmaker.com>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Tue, February 22, 2011 8:16:54 PM
Subject: Re: [RE-wrenches] Array tilt angle doesn't matter?


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.

From: Dave Palumbo 
Sent: Tuesday, February 22, 2011 3:51 PM
To: 'RE-wrenches' 
Subject: Re: [RE-wrenches] Array tilt angle doesn't matter?
Tom,
 
This is coming from old memory, so I give this with a grain of salt, but I 
believe the noontime sun angle at my latitude (44.5) is about 78 degrees on June 
21st and about 22 degrees on December 21st. That’s a difference of 56 degrees.
 
David Palumbo
Independent Power LLC 
462 Solar Way Drive
Hyde Park, VT 05655
www.independentpowerllc.com 
NABCEP Certified PV Installer
Vermont Solar Partner
23 Years Experience, (802) 888-7194 
 
 
 
From:re-wrenches-bounces at lists.re-wrenches.org 
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Tom Elliot
Sent: Tuesday, February 22, 2011 7:46 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Array tilt angle doesn't matter?
 
 
“The further north you go the wider the summer to winter sun angle.”
 
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.
 
Tom
 
 
 
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