Something's happening this Halloween that literally only comes once in a blue moon.
According to NASA, a Blue Moon is the second full moon in a calendar month. On the night of October 31, there is an event called "Blue Moon", which is nothing more than the appearance of a second Full Moon in a single month. Yes folks, a Blue Moon will be seen in the Halloween night sky on October 31. However, this October is a special occasion when the same month gets two full moons.
What is a Blue moon? This means that both the Harvest Moon and the Hunter's Moon will occur within the month of October, which is why the Hunter's Moon has been dubbed as the Blue Moon.
Astronomy Ireland has told its readers that that "Saturday is also the date that the distant dim planet Uranus is at opposition to the Sun (and effectively a Full Moon is when the Moon is at opposition with the Sun), so, Uranus is close to the Moon that night also".
The month of October saw the occurrence of the first full moon around October 1 and October 2 and the next full moon falls on October 31. Whenever a Blue Moon occurs, the total number of full moons for that particular year becomes 13 which usually remains 12 under normal circumstances. In the recent past, the blue-coloured moon was sighted in 2018 on January 31 and on March 31 whereas it will be witnessed in the immediate future only on August 31, 2023.
However, the colour of the Blue Moon won't actually be blue and it will appear like it would any other day.
When will it be visible in India? It takes our Moon roughly 29.5 days to complete one full cycle of phases (from new Moon back to new Moon), so if a full Moon happens to occur on the first of the month, it will be by followed by a second full Moon, AKA a Blue Moon, at the end of the month except in the month February.