Moon phase (also called Lunar phase) is a visible shape of the moon, as seen by observer in the sky..
When the Moon is growing (waxing), the shape is concave from the left side, and when is shrinking (wanning) - from the right side. If the language allows, children are often taught to associate the shape with the similar letter, frequently adding imaginary vertical dash. For instance, in Lithuanian, the words are Dyla (shrinking) and Pilnėja (growing). We are lucky to have the impressive views of the comparatively very large satellite for the planet of our size.
The dark side of the Moon is also sometimes visible, as it is illuminated by the glow of the Earth. The shadow of the Earth has no influence on the regular Lunar phases. This shadow only touches the Moon during lunar eclipses that are infrequent events.
Lunar phase is important in astrology. It also has been subject of serious scientific studies, suspecting that it may influence the success, but the researchers found no scientific evidence
Moon applet by Akkana Peck.