A full 2026 Panchang: each day's tithi, nakshatra, yoga and karana, plus festivals and auspicious days — localised to your city's sunrise and sunset.
Sankranti marks the Sun's entry into a new sidereal sign — twelve a year, with Makar Sankranti in January the best known. Purnima is the full Moon and Amavasya the new; Ekadashi is the eleventh tithi of each fortnight, so it falls twice a month. These are computed from the ephemeris for the year rather than copied from a printed almanac, which is why they line up with the rest of the site.
Tithis begin and end at a precise moment, not at midnight, so a festival tied to a tithi can fall on different Gregorian days depending on your location and on which convention a given panchang follows for a tithi that spans two sunrises. Where regional practice genuinely differs, the honest answer is that both dates are defensible and your family's tradition decides.
Because tithis start and end at exact times rather than at midnight, and regional traditions differ on which day to assign when a tithi spans two sunrises. Neither calendar is wrong.
The eleventh tithi of each lunar fortnight, so it occurs twice a lunar month — once in the waxing half and once in the waning.