The App calculates Shuddha Ekadashi, Tithis and Nakshatras, Sunrise and Sunset timings as well Moon timings potentially for all places in the world. All calculations are done offline by Gaurabda Calendar program - GCal. GCal is developed by Gopalapriya Das of ISKCON Bratislava. GCal is a free and full-featured calendar calculation program for Gaudiya Vaisnavas.