Lunar eclipse occurs when part or the whole cross section of months covered by the shadow of the earth. That happens when the earth is between the sun and moon on the same straight line, so that sunlight can not reach the moon because of blocked by the earth.
With other explanations, a lunar eclipse when the moon was emerging in opposition with the sun. But because the slope of the field of the moon's orbit to the plane of the ecliptic, the moon is not any opposition to the sun will result in the occurrence of a lunar eclipse. The intersection area of the moon's orbit to the ecliptic plane will bring 2 pieces of cut points are called nodes, that is the point at which the moon cuts the ecliptic plane. This lunar eclipse will occur when the moon is in opposition to the node. Moon takes 29.53 days to move from one point of opposition to the other opposition point. So it should be, in case the lunar eclipse, solar eclipse will be followed by the second node because it lies on the line that connects the sun with the earth.
Actually, the lunar eclipse event, sometimes months can still be seen. This is because there still exists the sunlight that is deflected toward the moon by the earth's atmosphere. And most of the deflected beam has a red light spectrum. That is why at the time of lunar eclipse, the moon will appear dark red can be copper, orange, or brown.
Lunar eclipse can be observed with the naked eye and is not dangerous at all.
The types of lunar eclipse
Total lunar eclipse
At this eclipse, the moon will just be on the umbra.
Partial lunar eclipse
At this eclipse, not all parts of the moon blocked the sun by the earth. While most of the other lunar surface in the penumbra region. So there is still some sunlight reaching the surface of the moon.
Penumbral lunar eclipse
At this eclipse, all parts of the moon is in the penumbra. So the moon can still be seen with the bleak colors.
source: wikipedia
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