This calendar is distinguished over other calendars in the world by two basic features, the first of which is that it matches the vision of the legal new moons at all, so it does not advance it by a day nor is it late by a day .. Therefore it defies error, and it represents righteousness with the glory of God over time, and the second is that it controls the issue of pressing that is hot In controlling the ancient astronomers and modernists, they made the place of the leap day in leap years absolutely at the end of the month of Dhu al-Hijjah, which is a gross mistake, and one of the reasons for astronomers and calculators to confuse their calculations, despite the scientific progress and technological superiority in the era of space conquest and walking on the surface of the moon.