Sensex, Nifty Today: The 30-share Sensex closed zoomed 855.3 points or 1.09 per cent to hit close at 79,408.5 on April 21. On the other hand the Nifty 50 index surged 273.9 points or 1.15 per cent to close at 24,125.55 levels. Notably the headline indices have extended a gaining spree for the fifth straight session.