The moon, referred to in the Quran as 'al-Qamar,' holds a multifaceted significance in Islam. It is not merely a celestial body but a profound sign (ayah) of Allah's creative power, wisdom, and mercy. The Quran highlights its role as a natural calendar, with its predictable phases allowing humanity to calculate years and determine the timings for crucial acts of worship such as the annual fast of Ramadan and the Hajj pilgrimage. Classical scholars like Ibn Kathir and Al-Qurtubi emphasize that the moon, along with the sun, travels in a precise, divinely ordained orbit, demonstrating the perfect order of the cosmos and the falsehood of worshipping celestial bodies. The distinction made in the Quran between the sun's 'radiance' (diya) and the moon's 'light' (nur) has been interpreted by many scholars to allude to the moon's light being a reflection, a notion that resonates with modern scientific understanding. Furthermore, the moon is the subject of one of the most significant miracles of the Prophet Muhammad (peace be upon him) – its splitting asunder – an event that serves as a powerful testament to his prophethood and a reminder of the impending Day of Judgment. Thus, the moon in Islam is a constant celestial reminder of God's oneness, power, and guidance.