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.
In this simulation, you can see how the moon orbits the earth and the earth orbits the sun. http://www.bbc.co.uk/schools/scienceclips/ages/9_10/earth_sun_moon.shtml. Go to site. Light and Shadows. In this activity, students discover how an object's shadow changes its angle and size throughout the day. Students begin inside by testing objects in a light from a projector. Then, they move outside to discover how an object's shadow changes as the sun or moon moves across the sky.