Final answer:
The predictable pattern of the lunar cycle can be explained using the revolution of the sun, earth, and moon system. The changing angle of the moon's illumination by the sun causes the different phases of the moon that we observe.
Step-by-step explanation:
The predictable pattern of the lunar cycle can be explained using the revolution of the sun, earth, and moon system. The changing angle of the moon's illumination by the sun is what causes the different phases of the moon that we observe.
As the moon orbits the earth, the sun's light illuminates different parts of the moon's face depending on the angle it makes with the moon. When the moon is between the earth and the sun, we see the side of the moon that is not illuminated, resulting in a new moon. As the moon continues its orbit, we gradually see more of the illuminated side, leading to the first quarter, full moon, and third quarter phases.
This pattern repeats itself due to the consistent revolution of the sun, earth, and moon system. Each lunar cycle lasts approximately 29.5 days, which is why we have a new moon roughly once a month.