Re: Position of Sun vs time and date?

From: starman (starman_at_tech.net)
Date: 07/17/04 

Date: Sat, 17 Jul 2004 03:31:35 -0400

BllFs6 wrote:
>
> Hi all...
>
> Here is the background...
>
> Been trimming a friends back yard of large tree branchs for the past few
> days....
>
> Some are dead or diseased and some are obviously shading areas where full (or
> at least more) sun is desired and some branches have WAY too much weight out to
> far and need thinning to avoid breaking...
>
> Well, all the obvious stuff has been done..
>
> Now, there is one part of the yard with a nice flower/plant garden...and these
> plants should only have a few hours of sun a day...and if I cut the wrong
> branches of the tree that shades it I might mess it up...
>
> So, what I need is the position of the sun as a function of time of year and
> hour of the day....and I dont even really need high precision...data for every
> hour and every 2 weeks would probably be fine...
>
> Anyone know of a simple online caculator I can use to generate those numbers?
> Id rather not install any programs on my friends computer....
>
> Now that I think about it, i could do with even simpler information...just
> three numbers per date (again at 2 week intervals).....the compass heading of
> where the sun rises and sets and the angle from horizontal/vertical the sun
> travels through the sky at the chosen date....
>
> With that info I could take a large *** of cardboard out in the back yard,
> orient it correctly at the right places in the garden and then eyeball along it
> to see which branches need to go and stay....
>
> I live at latitude 30 north....
>
> BTW, anyone know when oak trees in northwest florida/the southeast loose their
> leaves and when the grow back? (since dates when the tree has no leaves really
> wont matter then :)
>
> thanks for any input
>
> take care
>
> Blll

You can get a shareware version of 'Skyglobe' at the following website.
It's an astronomy program for a PC. It operates in DOS. When you put the
mouse cursor on the sun it will tell you it's altitude and azimuth. You
can do this for any time and day of the year.

http://coke.physics.ucla.edu/laptag/Astro.dir/astrocls.dir/Labs.html

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