To create a blood moon, the earth should not fully block the sun and allow some light to reach the surface of the moon, through earth’s atmosphere.
Blood Moon 2018 or Total Lunar Eclipse 2018: People across the world are all set to watch the Blood Moon 2018 which will be the longest total lunar eclipse of the 21st century. The marvellous lunar phenomenon is set to take place on the night of July 27 and July 28 and is expected to be visible in India, parts of Europe, Africa, Asia, Australia and New Zealand.
An interesting fact is that the July 27 blood moon could occur around the time when Mars will be the closest to the Earth in the last 15 years.
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How a Blood Moon is formed?
For a Blood Moon to be formed, the Earth and the Moon should be positioned in a relation to the Sun leading to a lunar eclipse.
A lunar eclipse occurs when the Moon passes directly behind Earth and into its shadow which usually results in the Moon disappearing from the sky.
To create a blood moon, the Earth should not fully block the Sun and allow some light to reach the surface of the Moon, through Earth’s atmosphere.
This is known as the ‘Rayleigh scattering’ phenomenon when the rays of the Sun gets filtered because of Earth’s atmosphere.
Rayleigh scattering is the filtering of certain bands of colour by sunlight and those least affected become the colour of the light.
Thus, in Blood Moon, the red and orange colours in the spectrum are least effected giving the moon its red glow.
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