The Sensex declined by 82.79 points, or 0.10 per cent, to close at 81,361.87. During the day, it moved between an intra-day high of 81,583.94 and a low of 81,191.04. Similarly, the Nifty also ended lower by 18.80 points, or 0.08 per cent, to settle at 24,793.25.