Those who fish flats with the sun at their backs know how frustrating it is to see fish scatter in front of them as they move along. When fishing away from the sun, make sure your reel is loaded to the spool rim with fresh, light line. Full spools and light line allow longer casts. For optimum success, cover all fishable water in front of your shadow before moving because on a bright day fish are extra cautious. When the sun is very low at your back in early morning or late afternoon, you'll cast a long shadow.
Fish instinctively are wary of any moving shadows.
They're on guard and flee at the slightest excuse, especially when the water is clear and shallow. If you have no choice but to wade in that direction, try to do so when the sun is high. That reduces shadow length considerably. I often catch a good stringer of fish at midday knowing that my shadow is short and isn't likely to disturb the fish as I wade. When fish are working the shallows, you need to pay attention to the fact that they can see better looking away from the sun.