That's a common misconception! While it takes roughly a month for the moon to complete a full orbit around Earth, it's not the orbit that takes a month. Here's why:

* Orbital Period: The time it takes the moon to complete one full orbit around Earth is about 27.3 days. This is called the sidereal month.

* Synodic Month: The time it takes the moon to go through its complete cycle of phases (from new moon to new moon) is about 29.5 days. This is called the synodic month.

So, why does it feel like the moon orbits every month?

* Lunar Phases: The moon's phases are determined by how much sunlight is reflecting off its surface, as seen from Earth. It takes about 29.5 days for the moon to cycle through all its phases, making us perceive it as a month-long cycle.

* Calendar Months: Our calendar months are roughly based on the synodic month. While they vary in length, they are designed to align with the moon's phases.

In short: The moon's orbit takes about 27.3 days, but we experience a month-long cycle because of the moon's phases.