A Lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the sun, Earth and moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, a Lunar eclipse can occur only the night of a full moon. The type and length of an eclipse depend upon the Moon's location relative to its orbital nodes.

A total lunar eclipse has the direct sunlight completely blocked by the earth's shadow. The only light seen is refracted through the earth's shadow. This light looks A lred for the same reason that the sunset looks red, due to rayleigh scattering of the more blue light. Because of its reddish color, a total lunar eclipse is sometimes called a blood moon.



Blood Moon is not a scientific term, but has come to be used due to the reddish color seen on a Super Moon during the lunar eclipse. When sunlight passes through the earth's atmosphere, it filters and reflects in such a way that the green to violet lights on the spectrum scatters more strongly than the red light.This results the moon to get more red light.

The first Blood Moon eclipse in the ongoing series of four happened on the night of April 14-15, 2014. The second one took place was October 7-8, 2014, and the third one (the shortest total lunar eclipse of the 21st century) was April 4, 2015. The fourth and final total lunar eclipse of the ongoing lunar tetrad – four total lunar eclipses in a row, spaced at six full moons apart – will fall on the night of September 27-28. It’ll be visible to sky watchers in North America. 

Unlike a solar eclipse, which can be viewed only from a certain relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of the Earth. A lunar eclipse lasts for a few hours, whereas a total solar eclipse lasts for only a few minutes at any given place, due to the smaller size of the Moon's shadow. Also unlike solar eclipses, lunar eclipses are safe to view without any eye protection or special precautions, as they are dimmer than the full moon.

Blood moon will occur when the Earth will completely cover the Moon from sunlight. Even more special, at this time the phenomenon of Blood Moon Moon and Earth are in closest distance over the years.
In this phenomenon, the Sunlight shine through the dusty ring of Earth's atmosphere. That light will be refracted by the Earth's atmosphere ring. The atmosphere then make the light color becomes red and the results of refraction will be heading to the moon's surface


During the process, the moon will not directly red, but changed gradually from gray to orange, and then after perfect it will be red blood. In the previous event, eclipse moon color will vary, depending on the amount of dust in the Earth's atmosphere at that time. This eclipse will end with the release of the earth's shadow on the disc in the upper right

The dust in the upper atmosphere also caused by natural events. Dust scattered in the Earth's atmosphere because of the active volcano spewing tons of volcanic ash into the atmosphere and cause red eclipse.

Red color on the moon when eclipse could also be an indicator of the level of air pollution that occurs on Earth as if the more  red indicates air pollution in our earth has entered a phase that is quite alarming, and also conversely if a region is still low levels of pollution , then the month in the area will only be colored yellowish color only.

 Source :
 http://earthsky.org/space/what-is-a-blood-moon-lunar-eclipses-2014-2015
https://en.wikipedia.org/wiki/Lunar_eclipse
http://www.geografikita.com/2015/12/fenomena-bulan-berdarah-blood-moon.html

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