[Phys-L] Re: Hours of sunlight

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 01:11 PM 11/23/2005, you wrote:
> Howdy-
>
> Say I want to know the number of hours of sunlight
> that a spot in my garden will get over a day. Say I am
> not largely worried right now as to the total energy,
> just the amount of sun.
>
> If the spot is flat and there are no nearby walls, I
> can figure the hours of light by looking up the
> sunrise and sunset times and subtracting.
>
> On the other hand, if there are nearby walls and
> trees, I need to know the angle of the sun off the
> horizon and the sun's path, the height of the wall and
> distance to my patch of ground, and a bunch of trig to
> figure out how much sun the area gets.
>
> Does anyone know of a resource to help me make these
> calculations?
>
> Marc "Zeke" Kossover

The astro-compass was and apparently still is a handy tool
for making such determinations. It is set for the latitude
etc., and sights the limits of visibility on the ecliptic
(at least, I THINK that's the plane in question).


Brian Whatcott    Altus OK    Eureka!
_______________________________________________
Phys-L mailing list
Phys-L@electron.physics.buffalo.edu
https://www.physics.buffalo.edu/mailman/listinfo/phys-l