[Market-farming] spacing tunnels

Erik Lane eriklane at gmail.com
Sun May 20 21:48:02 EDT 2012


That number isn't right. Tangent(22) = 0.404, but that is opposite
over adjacent, which means that if you divide the greatest height by
0.404 then it will give you the length of the shadow, not multiplying
by 0.404.

Equivalently you could simply multiply the center height by 2.5 and
that gives you the approximate greatest length of the shadow. For my
own garden I would use 30 degrees, since only at the depth of winter
is it worse than that. If you are okay with that then you can instead
go with 1.75 times the height to get the length of the shadow along
the ground from that point. For at least 11 months out of the year
that would be good enough.

Erik

On Sun, May 20, 2012 at 6:12 PM, Tom <tomsgardens at yahoo.com> wrote:
> Beth, you can calculate the shadow length you will get on day of the winter
> solstice, and that will give you the longest possible shadow of the year for
> your new house.  Keep your southerly house that distance away and you should
> be OK.  All you have to do is multiply the height of your new house (the
> south one) by .404 and you will get the shadow length at noon.  There is a
> small catch, though.  This calculated length has to be measured from the
> center of your new  house out toward the old house, not from the wall.
>
> In other words, .404 times the height of new house = distance from center of
> new house to the end of its shadow on the north side.  This is on the first
> day of winter and is the longest shadow the house will ever cast, since the
> sun is higher in the sky the rest of the year.
>
> I'm pretty sure of my calculations, but I would check with others before you
> go ahead and put up the new house.
>
> If this doesn't make sense, let me know and I'll try to 'splain it better.
>
> ==============
> Tom at Tom's Gardens
> Cut Flowers & Veggies
> Northern Lower Michigan
> ________________________________
> From: Beth Spaugh <lists at rhomestead.com>
> To: 'Market Farming' <market-farming at lists.ibiblio.org>; 'High tunnel
> discussion list' <HIGHTUNNELS at LISTSERV.KSU.EDU>
> Sent: Sunday, May 20, 2012 5:55 PM
> Subject: [Market-farming] spacing tunnels
>
> We have lot line issues where I want to put a tunnel to serve as a wash
> station/packing shed, maybe spring greenhouse.  We are looking at gothic
> tunnels with 5 or 6 foot high walls (yes, need to find total height out for
> this question).  It will be due south of our current hoophouse (45 latitude,
> think Burlington VT but a little north).  Anyone know guidelines for how
> much space I need to leave in between so the current tunnel doesn’t get
> winter shade?  That distance will determine the width of the new tunnel.
> Thank you.
>
> Beth Spaugh
> Rehoboth Homestead, Peru NY
> http://rhomestead.com      http://www.facebook.com/rhomestead
>
> "How we eat determines, to a considerable extent, how the world is used." -
> Wendell Berry
> "Without power over our food, any notion of democracy is empty." - Frances
> Moore Lappe
>
>
>
>
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