When the moon is in the first quarter phase, it is located approximately 90 degrees east of the sun in relation to the Earth. This means that the sun, Earth, and moon form a right angle, with the moon being ahead of and to the east of the Earth.
During the first quarter moon phase, the moon is located at a 90-degree angle from the Earth and the Sun. This means that if you were to draw a line connecting the Earth, the Moon, and the Sun, it would form a right angle. The first quarter moon rises at noon and sets around midnight. From Earth, we see half of the moon illuminated on the right side, resembling a letter "D".
