Some personal problems it solves for me:
- I hike/ski/climb a lot and want to know how late I can sleep in and still avoid the worst of the sun [2]
- I'm getting married this year and had wedding photos taken in a meadow in the mountains and we needed to set a time to meet with the photographer for a 2 hour session where we would still get sun but as late in the evening as possible.
- We're getting married in a back yard and want to place tables in a shady location for 5pm dinner
- I have a car I use occasionally and want to park it in a location that receives very little sun so the rubber/paint doesn't deteriorate as fast [3]
- We have a small van we take to the mountains and want to park it in the shade to keep it cool or sun to charge solar panels.
- etc, etc, etc
All these use-cases would be enhanced by trees and I can do it on my local machine but want to share if other people have similar needs.
[1] https://shademap.app/sunchart/#15/47.61754/-122.34365
[2] https://shademap.app/shadeprofile/
[3] https://shademap.app/@47.61767,-122.34993,16.13693z,16889544...