The name of the moon phase at the beginning of the month is the New Moon. This phase occurs when the moon is positioned between the Earth and the sun, making it invisible from Earth. The New Moon marks the start of a lunar cycle, which typically lasts about 29.5 days. During this phase, the moon's illuminated side is facing away from Earth, and the sun's light reflects off the moon's unilluminated side, creating a dark sky. The New Moon is a significant phase in various cultural and astronomical contexts, as it sets the stage for the subsequent waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and waning crescent phases.

The New Moon phase is crucial for understanding the moon's cycle and its impact on Earth. According to NASA, the moon's phases are determined by its position in relation to the Earth and the sun. During the New Moon, the moon is in conjunction with the sun, meaning they are aligned in the same direction. This alignment causes the moon to be in the Earth's shadow, making it invisible from our perspective. The New Moon phase is also associated with a period of darkness and renewal, as it signifies the beginning of a new lunar cycle.

The New Moon phase is not only important in astronomy but also in various cultural and spiritual practices. For example, in some Eastern cultures, the New Moon is considered a time for reflection, meditation, and setting intentions. It is believed that during this phase, the moon's gravitational pull is at its weakest, allowing for a sense of clarity and peace. Additionally, the New Moon is often associated with the start of a new month, which can be a time for setting goals and making changes.

In conclusion, the moon phase at the beginning of the month is the New Moon. This phase occurs when the moon is between the Earth and the sun, making it invisible from Earth. The New Moon is a significant phase in both astronomy and cultural practices, marking the start of a new lunar cycle and a period of renewal. According to NASA, the moon's phases are determined by its position in relation to the Earth and the sun, with the New Moon being the first phase in the lunar cycle.