Hi Marcelo,
Many of the experts in the list will be able to provide you with all the math necessary to address your problem, but I would like to offer you a different approach. Google SketchUp has the functionality to simulate the sun path and project the shadows of 3D objects based on the latitude, longitude, date and time. So, my propoasal is to create a simple 3D model of your graden with the main surrounding obsticles (walls, fences, roofs, etc.) and simulate the shadow cast. It is a very simple process that can help you.
In the past I used GS to test some sundial prototypes before building them. As far as I remember, I think one of the members of the list has developed some simlulations of sundials using GS as well.
Hope it helps.
Um abraço,
Ricardo Cernic
São Paulo - Brazil
http://relogiosdesol.blogspot.com
Ricardo Cernic
São Paulo - Brazil
http://relogiosdesol.blogspot.com
De: Marcelo < [email protected] >
Enviada: Quinta-feira, 2 de Janeiro de 2014 17:37
Para: Sundial List < [email protected] >
Assunto: Garden planning problem
Hello fellow dialists, how are you?
I'm with a problem here which doesn't concern exactly to sundials, but
since it deals with sun's position and his shadows, I couldn't think
of anyone better than you to help me.
I have a little garden here at home, a walled area where I grow some
plants in pots. I've found that, depending on the place, teher's a
difference greater than 2.5 hours in the sunlight a plant receives,
and that affects greatly its development.
I've measured the shadows cast before and after true noon during
summer solstice (I live slightly south to the Tropic of Capricorn). I
could repeat the process during equinox and winter solstice, but< br />that's a boring task, and above all, if the weather is cloudy I'll
miss the chance.
So, can you tell me some trigonometrical method for calculating the
shadows, using sun's altitude and azimuth? I couldn't devise one by
myself.
Thanks in advance, and Happy New Year!
Marcial
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