Photo reconnaissance sorties
I was looking at some of the Peenemunde photographs and I noticed how the shadows made it so much easier to identify the launch tower and that the blast pit was cut into the ground and it got me thinking: Were reconnaissance sorties specifically planned for early morning or late evening to take advantage of the low sun angle?
...and if they were, did the enemy, or for that matter us, take this into consideration and expect those sorties to occur at those times?