When the Sun and the Moon are both visible in the sky together, it is called a "solar-lunar conjunction" or a "Sun-Moon conjunction." This term refers to the alignment of the Sun, the Moon, and an observer on Earth, where both celestial bodies appear in close proximity to each other in the sky.
During a solar-lunar conjunction, the Moon is typically seen as a thin crescent or a partial Moon since the Sun's brightness often obscures a significant portion of the Moon. However, it's important to note that observing the Sun directly without proper eye protection can be extremely dangerous and should be avoided.
In some instances, particularly during a solar eclipse, the Moon can align perfectly with the Sun, resulting in the Moon obscuring the Sun's disk either partially (partial solar eclipse) or completely (total solar eclipse). During a total solar eclipse, observers within the path of totality can witness the Moon completely covering the Sun, leading to a temporary darkening of the sky. However, this is a rare and localized phenomenon that occurs along a narrow path on Earth's surface during specific celestial alignments.