1. When the Moon moves into the Earth's shadow, causing the moon to be darkened an astronomical event occurs which is known as Lunar Eclipse.
2. When moon’s orbit is closet to the earth , during the full moon phase, lunar eclipse occurs.
3. Lunar eclipse can occur only when the Sun, Earth, and Moon are exactly aligned with Earth.
4. The type and length of a lunar eclipse depend on how close the moon is to the lunar node.