What is a sequence of phases of the moon called as it revolves around the Earth?

The sequence of phases of the moon as it revolves around the Earth is referred to as a Lunar Cycle. This cycle is determined by the positions of the Earth, moon, and sun, leading to the observable changes in the moon's illumination as it progresses through its phases from new moon to full moon and back again over approximately 29.5 days.

The Lunar Cycle encompasses the various stages, including new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, and waning crescent. This terminology and understanding are crucial in astronomy, as it helps explain not only moon phases but also tidal patterns on Earth that are influenced by the moon's gravitational pull.

Other choices do not pertain specifically to the moon's phases. The Solar Cycle involves changes related to solar activity, such as sunspots and solar flares, while Cosmic and Galactic Cycles refer to broader astronomical patterns that do not focus specifically on lunar phases. Hence, the correct terminology for the sequence of phases observed in the moon is indeed the Lunar Cycle.