The moon orbits Earth regularly. Depending on the day, the moon may be fully visible, partially visible, or barely visible. The amount of visibility is determined by the lunar cycle. Use the graph to describe the lunar cycle.
Unfortunately, the graph you mentioned is missing from the question. However, I can still provide you a general description of the lunar cycle.
The lunar cycle refers to the repeating patterns of the moon's appearance in the sky, which is caused by its orbit around the Earth. The cycle lasts about 29.5 days, during which the moon goes through various stages of visibility.
At the beginning of the cycle, the moon is not visible from Earth due to its location relative to the Sun. This phase is known as the new moon. As the days progress, a small portion of the moon becomes visible, forming a crescent shape. This phase is called the waxing crescent.
Next, the visibility of the moon increases further, forming a half-moon shape, which is known as the first quarter. Following this, the moon continues to become more visible, eventually reaching a fully visible circle shape. This phase is called the full moon, and it occurs about halfway through the lunar cycle.
After the full moon, the visibility of the moon starts to decrease. It begins to wane and appears as a shrinking circle in the sky. The waning gibbous phase is followed by the third quarter, during which the moon is again half-visible, but the opposite side from the first quarter. The visibility continues to decrease, forming a crescent shape again, but this time the opposite side. This phase is known as the last quarter.
Finally, as the cycle comes to an end, the moon becomes completely invisible again, and the new moon phase starts the cycle anew.
In summary, the lunar cycle includes the following phases: new moon, waxing crescent, first quarter, full moon, waning gibbous, third quarter, and finally, the new moon again.