instruction: What are the important points about Lunar eclipse in the given text?
context: A lunar eclipse is an astronomical event that occurs when the Moon moves into the Earth's shadow, causing the moon to be darkened. Such alignment occurs during an eclipse season, approximately every six months, during the full moon phase, when the Moon's orbital plane is closest to the plane of the Earth's orbit.
  This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned (in syzygy) with Earth between the other two, which can happen only on the night of a full moon when the Moon is near either lunar node. The type and length of a lunar eclipse depend on the Moon's proximity to the lunar node
response: 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.