Ramadan (Arabic: رمضان‎ Ramaḍān, IPA: [rɑmɑˈdˤɑːn]; ^variationsPersian: Ramazan‎) is the ninth month of the Islamic calendar, which lasts 29 or 30 days. It is the Islamic month of fasting, in which participating Muslims refrain from eating, drinking, smoking and sex during daylight hours and is intended to teach Muslims about patience, spirituality, humility and submissiveness to God. Muslims fast for the sake of God (Arabic: الله‎, trans: Allah) and to offer more prayer than usual. Compared to the solar calendar, the dates of Ramadan vary, moving backwards by about eleven days each year depending on the moon; thus, a person will have fasted every day of the Gregorian calendar year in 34 years' time. Muslims believe Ramadan to be an auspicious month for the revelations of God to humankind, being the month in which the first verses of the Qur'an were revealed to the Islamic prophet, Muhammad.

The word Ramadan is derived from an Arabic root R-M-Ḍ, as in words like "ramiḍa" or "ar-ramaḍ" denoting intense heat, scorched ground and shortness of rations. Ramadan, as a name for the month, is of Islamic origin. Prior to Islam and the exclusion of intercalary days from the Islamic calendar, the name of the month was Natiq and the month fell in the warm season.^[2] The word was thus chosen as it well represented the original climate of the month and the physiological conditions precipitated from fasting. In the Qur'an, God proclaims that "fasting has been written down (as obligatory) upon you, as it was upon those before you". According to a hadith, this might refer to the Jewish practice of fasting on Yom Kippur.^[3][4]

New Year's Day is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar used in ancient Rome. With most countries using the Gregorian calendar as their main calendar, New Year's Day is the closest thing to being the world's only truly global public holiday, often celebrated with fireworks at the stroke of midnight as the new year starts. January 1 on the Julian calendar currently corresponds to January 14 on the Gregorian calendar, and it is on that date that followers of some of the Eastern Orthodox churches celebrate the New Year. New Year's Day is a postal holiday in the United States.^[1]

The Romans dedicated this day to Janus, the god of gates, doors, and beginnings. After Julius Caesar reformed the calendar in 46 BC and was subsequently murdered, the Roman Senate voted to deify him on the 1st January 42 BC ^[2] in honor of his life and his institution of the new rationalized calendar.^[3] The month originally owes its name to the deity Janus, who had two faces, one looking forward and the other looking backward. This suggests that New Year's celebrations are founded on pagan traditions. Some have suggested this occurred in 153 BC, when it was stipulated that the two annual consuls (after whose names the years were identified) entered into office on that day, though no consensus exists on the matter.^[4] Dates in March, coinciding with the spring equinox, or commemorating the Annunciation of Jesus, along with a variety of Christian feast dates were used throughout the Middle Ages, though calendars often continued to display the months in columns running from January to December.^{[citation needed]}