Also known as a bloody moon, it can be a total eclipse or a partial eclipse, which is when only a slice of the moon is affected by the Earth's shadow.
A total lunar eclipse happens when the whole moon enters Earth's shadow, according to the United States National Aeronautical and Space Administration.
The eclipse, which will take place overnight from July 27 to 28, will occur during the next full moon.
The air also spread more shorter-wavelength light (in green or blue colors) followed by the longer-wavelength which redder at end of the spectrum.
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According to the scientists, it is going to be the longest total lunar eclipse of the 21st century that would occur on July 27, with the celestial spectacle visible to the human naked eye in a reddish colour, it can be seen entirety from all parts of India.
The eclipse will take place at or around midnight for Madagascar and the Middle East. Europe and Africa will view it sometime between sunset and midnight on 27 July, whereas most of Asia, Indonesia and Australia will view it in the morning - sometime between midnight and sunrise on 28 July.
The total duration of the partial phases is 2 hours, 12 minutes.
When the sun's rays fall into the planet's atmosphere, blue visible spectrum of solar radiation is scattered and the red passes through and penetrates the cone of shadow of Earth. From within the umbra, all direct sunlight is blocked by Earth as in the case of a total lunar eclipse.
Coincidentally, Planet Mars will be the closest it has been to Earth in 15 years on the same night. That event delighted moon watchers by being both a blood moon and super moon at the same time.