Please tell me whether it is wrong to see the moon on the fourth day of Amavasya, if so what should be done to avoid any complications.

Answer : Worry not, it is not a sinful act to see the moon on the 4th day. Generally, the third day of waxing moon used to be very thinn and visibility is so difficult for many. However, to test the eyesight sharpness,  and to give an excercise to the youngsters for eye sight effectiveness, they used to advise them to look for the moon on the third day from Amavasya (Moonraampirai). Thos who were with sharp eye sight used to catch it quickly thus proving their strong eye sight visibility. Incidentally, there is a chapter in the Rg Veda about the improvement of eyesight, named Chaakshoosaupanishad which is most useful for improving eye sight.