A lunar month is the period of time it takes for the Moon to complete one full cycle of its phases, from new moon to new moon. This duration is approximately 29.5 days, leading to the establishment of lunar calendars that are based on the Moon's cycles rather than the solar year. Many cultures have used lunar months to track time, with some calendars, like the Islamic Calendar, consisting of 12 lunar months. This system influences various cultural and religious practices, such as the timing of Ramadan in Islam, which is determined by the sighting of the new moon.