A rare celestial phenomenon will occur today as blue moon, supermoon and blood moon coincide on a total lunar eclipse day, also called "Chandra Grahan". Today will be the first lunar eclipse of the year and will be second full moon in the month. This is called "Blue Moon". In addition, the moon will appear crimson in colour. During total lunar eclipse, when the moon gets shadowed by earth, the sunlight passes through the earth's atmosphere and breaks down. The red part of the sunlight gets least refracted, giving moon the tinge of orangish red. This is called "Blood Moon". Further, when the eclipse happens, the moon will be close to earth by 60,000 km against the average distance between the moon and the earth. It will appear brighter and bigger. This is called "supermoon".
