When we were at the Grand Canyon, it was fascinating to see the shadows dance across the canyon around both sunrise and sunset. I would imagine that the same is true at Yosemite.
What time do you need to get to Glacier Point (or Sentinel Dome) to watch the shadows move across the Valley walls. We will be there on June 12 and 13. Sunset will be at 8:22 both nights. If we were there by 6:30, would that be early enough to "enjoy the show"?