are encouraged, although not obliged, such as: Fasting on Mondays and Thursdays. any 6 days in the lunar or "Islamic" month of Shawwal is desirable if possible. The White Days, the 13th, 14th, and 15th day of each lunar month (Hijri). the Day of Arafah (9th of Dhu'I-Hijja in the Islamic (Hijri) calendar). As often as possible in the months of Rajab and Sha'aban before Ramadan. First 9 days of Dhu al-Hijjah in the Islamic calendar (but not for any who are performing Hajj (the pilgrimage). Tasua (9th day) and Ashura (10th day) of Muharram. Days when fasting is forbidden Although fasting is considered a pious act in Islam, there are times when fasting is considered prohibited or discouraged according to the majority of the sunni scholars: Eid al-Adha and three days following it, because Muhammad said "You are not to fast these days. They are days of eating and drinking and remembering Allah", reported by Abu Hurairah. Eid al-Fitr It is also forbidden to single out Fridays and only fast every Friday, as 'Abdullah b. 'Amr b. al-'As said that he heard Muhammad say "Verily, Friday is an eid (holiday) for you, so do not fast on it unless you fast the day before or after it." Fasting every day of the year is considered non-rewarding; Muhammad said: "There is no reward for fasting for the one who perpetually fasts." This Hadith is considered authentic by Sunni scholars. The Quran contains no other prohibition regarding the days of fasting. In polar regions Nothing was said directly about the polar region and fasting. But there is Hadith about Al-Masih ad-Dajjal that proves that fast as prayers have to be estimated and done every 24 hours, this is the opinion of the Council of Senior Scholars in the Kingdom of Saudi Arabia. These concerns are because, at polar latitudes, summer solstices feature the midnight sun and winter solstices have polar night. These natural phenomena occur because the earth's axis tilts toward the sun in summer and away from the sun in winter, causing the poles to be exposed to the sun's rays for six months each, non-stop. The reason most of the earliest Muslims did not experience these phenomena during Islam's early days is that they did not live in polar regions but in the Subtropics, where the Sun can be directly overhead and does set at night. In Tafsir Maarif