just 2 days left!
Michael Judd says that if permies.com brings in $5000 to his kickstarter, then permies.com can decorate an entire page in his new book!
I'm not sure what we would put there just yet, but the opportunities for comedy are endless!


  • Post Reply Bookmark Topic Watch Topic
  • New Topic

App to predict sun and shade  RSS feed

Posts: 1191
Location: Torrey, UT; 6,840'/2085m; 7.5" precip; 125 frost-free days
bee books chicken duck goat trees
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Want a tree to shade a window at 5 pm on midsummer day? Want to make sure the neighbor's tree doesn't shade your garden site in mid-April? There's an app for that!
Actually, several. Photographers use them all the time to plan photo shoots. I went through my app collection and nothing seemed right for the permaculture crowd, until I found LightTrac.

Here are a couple screen shots, settings are June 21 at 5:30 pm. Question: how big of a tree do I need on the west side of my house to shade my bedroom window:
The first image is shows the length of shadow cast by a 15 ft tree.
The second image shows that at 5:30 the sun is due west (red line), and it is going to set pretty far to the north (blue line).
Going to need a bigger tree.

I have no interest in LightTrac, just found it useful in the field.

Mod: if this belongs in the solar forum, my apologies.
Edited to correct captions.
[Thumbnail for photo-1.PNG]
LightTrac screenshot 1
[Thumbnail for photo-2.PNG]
LightTrac screenshot 2
The human mind is a dangerous plaything. This tiny ad is pretty safe:
This is an example of the new permies.com Thread Boost feature
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!