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.
As the Moon orbits Earth, we see lunar phases as the amount of the Moon's sunlit face visible to us varies. At full Moon, we can see the entire illuminated side. At quarter Moon, only half the sunlit side can be seen. At new Moon, the sunlit face points away from us, and the Moon is all but invisible from Earth. The time between successive full Moons is one synodic month. The time taken for the Moon to return to the same position in the sky, relative to the stars, is one sidereal month. Because of Earth's motion around the Sun, the synodic month is about 2 days longer than the sidereal month. A lunar eclipse occurs when the Moon enters Earth's shadow.