Lunar Eclipse is an astronomical event which happens when the Moon passes behind the shadow of the Earth. The Sun always creates this shadow around the earth. This is a very rare occasion when the Sun, Earth, and the Moon are all exactly lined up and the Moon passes behind this shadow.
When the Moon goes through the umbral shadow of the Earth then a lunar eclipse is very easy to see, and viewed from any place of the earth at night.
The moon has a speed of about one kilometer/second through the shadow. Thus, a lunar eclipse has a total of almost 3 hours plus 40 minutes and approximately 107 minutes.
A lunar eclipse may be seen from anywhere at night on the Earth.
A selenehelion is also called selenelion that is occurring, when the eclipsed Moon as well as the Sun is observed at similar time just after sunrise or before sunset.
A lunar eclipse occurs only at the time of the full moon and may occur less than 3 times in one year.
A lunar eclipse is viewed from all hemispheres and at the same time, it is seen by everyone who has full moon sight. A lunar eclipse time may span in many hours due to local time zones.
Another type of lunar Eclipse is Penumbral Lunar Eclipse which is occurring after passing through the shadow of penumbral shadow. These events are subtle as well as slight to observe therefore these are only for academic interest.
Partial Lunar Eclipse is another type of lunar eclipse which happens only when one portion of the moon passes against the umbral shadow of Earth. These can also be viewed from an unaided eye.
When the full moon passes through the umbral shadow of the earth then Total Lunar Eclipse occurs. A myth is famous in Egyptian that the eclipse is like a sow which swallows the moon for a small time.