International Women's Day first emerged from the activities of labour movements at the turn of the twentieth century in North America and across Europe. Since those early years, International Women's Day has assumed a new global dimension for women in developed and developing countries alike.
The shadowed portion is entirely hidden from view. The first quarter and third quarter moons (both often called a half moon), happen when the moon is at a 90 degree angle with respect to the earth and sun. So we are seeing exactly half of the moon illuminated and half in shadow.
My hand's shadow, like all Sun shadows, has two parts: the dark part on the inside (called the umbra) and the lighter part (the penumbra) around the edges of the shadow. It has two parts because the Sun is not a point source but rather a disk. Let's shift our gaze into space.