The phases of the moon are the different appearances of the moon as seen from Earth, caused by the changing position of the moon relative to the sun and Earth. As the moon orbits the Earth, the portion of the moon illuminated by the sun that we can see changes, creating the phases we observe.
Here are the eight main phases of the moon, in order:
1. New Moon: The moon is completely hidden, as it's positioned between the Earth and the Sun.
2. Waxing Crescent: A thin sliver of the moon becomes visible, starting on the right side as seen from the Northern Hemisphere.
3. First Quarter: Half of the moon is illuminated, appearing as a half-circle on the right side.
4. Waxing Gibbous: More than half of the moon is illuminated, becoming more full each night.
5. Full Moon: The entire face of the moon is illuminated, appearing as a bright, round disc.
6. Waning Gibbous: The moon begins to decrease in size, with more than half of it still illuminated.
7. Last Quarter: Half of the moon is illuminated, appearing as a half-circle on the left side.
8. Waning Crescent: A thin sliver of the moon remains visible, shrinking each night, on the left side.
These phases repeat approximately every 29.5 days, forming a lunar cycle.
