Ramadan is the ninth month of the Islamic calendar; Muslims worldwide observe this as a month of fasting. This annual observance is regarded as one of the Five Pillars of Islam. Lanterns have become symbolic decorations welcoming the month of Ramadan. In a growing number of countries, they are hung on city streets.
It is well known that the beginning of the Islamic month is based on the visibility of the earliest crescent moon as reported by two reliable witnesses. Thus, depending on local sighting, the calendar differs from one place to another. Amongst all the possible local Islamic calendars, that of Makkah is specially precious in order to determine the date of the annual pilgrimage.