Friday the 13th is considered an unlucky day in Westernsuperstition. It occurs when the 13th day of the month in the Gregorian calendar falls on a Friday, which happens at least once every year but can occur up to three times in the same year – for example, in 2015, the 13th fell on a Friday in February, March, and November. 2017 through 2020 will all have two Friday the 13ths, and the years 2021 and 2022 will have just one occurrence each.[1]
A Friday the 13th occurs during any month that begins on a Sunday.
History
The irrational fear of the number 13 has been given a scientific name: “triskaidekaphobia“; and on analogy to this the fear of Friday the 13th is called paraskevidekatriaphobia, from the Greek words Paraskeví (Παρασκευή, meaning “Friday”), and dekatreís (δεκατρείς, meaning “thirteen”).[2]The Last Supper by Leonardo da Vinci
The superstition surrounding this day may have arisen in the Middle Ages, “originating from the story of Jesus’ last supper and crucifixion” in which there were 13 individuals present in the Upper Room on the 13th of Nisan Maundy Thursday, the night before his death on Good Friday.[3][4] While there is evidence of both Friday[5] and the number 13 being considered unlucky, there is no record of the two items being referred to as especially unlucky in conjunction before the 19th century.[6][7][8]
He [Rossini] was surrounded to the last by admiring friends; and if it be true that, like so many Italians, he regarded Fridays as an unlucky day and thirteen as an unlucky number, it is remarkable that on Friday 13th of November he passed away.[9]
So guys here is the answer why 13th Friday considered as unlucky day thank you