Round Valley in the late afternoon often makes a natural sundial. Whenever I see this, I start singing “Sunny Hours” by the Long Beach Dub Allstars, one of my favorite hip-hop songs.

 I only count the sunny hours, brightest hours of day. 
 I never count the gloomy hours I let them slip away. 

Trees on a valley floor are just in the shadow, with a sharp line above them made by the change from shadow to light where the mountain blocks the sunlight.