At sunrise, the sky isn't actually up in the sky yet. Twilight occurs before sunrise, then at sunrise the leading part of the sun crosses the horizon. But, the sky isn't bright yet. It takes some time for the sky to be blue again.
Then, at the closing of the day, the sky darkens before twilight, then sunset.
Basically, there is a narrower time when the sky is bright and blue, rather than being the time between sunrise and evening twilight. Is there a name for these times, or at least a name for its boundaries?
Here's a picture to better point out what I mean:
The shaded part after sunrise I label 1 is the part after sunrise, when the sky is still dark but the sun is out in the sky (here's an image).
The shaded part just before sunset I label 2 is the part when the sky is already darkening, but it's not yet sunset as the sun hasn't set below the horizon (an image again).
The large portion of the day I label 3 would be the part when the sky is blue and bright, the term for which I'm asking for, if it exists (here's an image).