Silla (month) Silla (month) Sillā (Nepal Bhasa: सिल्ला) is the fourth month in the Nepal Era calendar, the national lunar calendar of Nepal. The month corresponds to Magha (माघ) in the Hindu lunar calendar and February in the Gregorian calendar. Sillā begins with the new moon and the full moon falls on the 15th of the lunar month. The month is divided into the bright and dark fortnights which are known as Sillā Thwa (सिल्ला थ्व) and Sillā Gā (सिल्ला गा) respectively. The most important festivals during the month are Shree Panchami which falls on the fifth day of the bright fortnight
Leap year lunar months containing 29 or 30 days, generally in alternating order. However, the tabular Islamic calendar used by Islamic astronomers during the Middle Ages and still used by some Muslims does have a regular leap day added to the last month of the lunar year in 11 years of a 30-year cycle. This additional day is found at the end of the last month, Dhu 'l-Hijja, which is also the month of the Hajj. The Hijri-Shamsi calendar, also adopted by the Ahmadiyya Muslim Community, is based on solar calculations and is similar to the Gregorian calendar in its structure with