David:
Here is a handy site: http://www.susdesign.com/sunangle/
Put in the information from your neighborhood for winter and summer
solstice and get back to us on the difference.
In my neighborhood, the sun altitude angle at noon on winter solstice is
about 31.6 degrees. On summer solstice at noon (not corrected for DST) the
sun altitude angle is 78.4 degrees. The difference is 46.8 degrees.
I realize that solar noon is slightly different from clock noon, but the
answers you get at clock noon should be very close to correct for solar noon.
William Miller
At 05:51 PM 2/22/2011, you wrote:
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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. Thatâs 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-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@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?
âThe further north you go the wider the summer to winter sun angle.â
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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