Moonlight illumination is determined by the position and phase of the moon. It is typically represented by three main indicators: Score (0% to 100%), Phase (such as New Moon, Full Moon, First Quarter, etc.), and Angle (the ecliptic longitude). The score represents the illuminated fraction of the moon’s visible surface, with 0% being completely dark (New Moon) and 100% being fully illuminated (Full Moon). The phase describes the shape of the illuminated portion of the moon. The angle indicates the moon’s position relative to the Earth and Sun. These factors affect not only the beauty of the night sky but also phenomena like tides, animal behavior, and ancient calendars. Accurate calculation of moonlight illumination is essential for astronomers, photographers, and outdoor enthusiasts. In this calculator, by simply entering the date and time, you will obtain an estimated moonlight score, phase, and angle. This helps you to better understand the lunar cycle and plan activities like stargazing, night photography, and even agricultural practices, which have historically relied on lunar illumination. The moon’s light has guided humanity for millennia, and with this tool, you can continue that tradition with precision and ease.