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.
The animation moves fast, but you can see that the moon has half its surface lit by the sun. As the moon circles the Earth each month, it presents different amounts of that sunlit side to the Earth. Most of the time, some of the sunlit side of the moon will not be in our view.