Galungan Nadi - If Galungan Day coincidences with Purnama (full moon) - similar to the first celebration which took place at Purnama, October 15, 882 AD - then the ngotonan (anniversary) of Galungan is celebrated, a special day that is blessed by Sang Hyang Ketu (Dewa Kecemerlangan). Galungan Nadi occurs about every 10 years and is celebrated in a much more solemn way than ordinary Galungan celebrations; in general the offerings on this day will be more elaborate.