If a lunar month is 29.5 days how can a lunar orbit be 28 days?

A lunar month, often referred to as a synodic month, is the time it takes for the Moon to return to the same phase (e.g., full moon to full moon), which is approximately 29.5 days due to the Earth's movement around the Sun. In contrast, the lunar orbit, or sidereal month, is the time it takes for the Moon to complete one full orbit around the Earth relative to the stars, which is about 27.3 days. The difference arises because as the Moon orbits the Earth, the Earth is also moving along its orbit around the Sun, requiring additional time for the Moon to catch up to the same phase.