Nikkei posts biggest one-day gain in 3 weeks

TOKYO, Feb 28 (Reuters) - Japan's Nikkei average posted its biggest one-day jump in three weeks on Thursday after a well-bid Italian debt auction calmed fears of renewed instability in Europe and as upbeat U.S. economic data buoyed risk appetite. The Nikkei climbed 2.7 percent to 11,559.36, breaking above its five-day moving average of 11,452.12 and nearing its 53-month high of 11,662.52 hit on Monday. The index shed 3.5 percent in the previous two sessions. The broader Topix index gained 2.3 percent to 975.66 in relatively active trade.