Yes. The length of a shadow is determined by the altitude of the Sun. Therefore shadows shorten then lengthen as each day progresses and, between days, shorten and lengthen as summer comes and passes.
Shadows change throughout the day due to the movement of the sun across the sky. As the sun rises and sets, the angle at which light hits objects changes, causing shadows to lengthen and shorten. The position of the sun also affects the direction and shape of shadows.
Your question isn't very clear but what this describes is the sun rising over the hills and as it does, so the shadows cast by the hills shorten or get driven back.
You don't shorten 'it has'.
you shorten it by etc.
Vitamins can't shorten your height.
Bill Shorten's birth name is William Richard Shorten.
Chick Shorten's birth name is Charles Henry Shorten.
Patricia Shorten's birth name is Patricia Shelley Shorten.
The verb of short is shorten. As in "to shorten something".
Chick Shorten is 6'.
I had to shorten my presentation to fit within the time limit.
Bill Shorten is 5' 10".