Friday the 13th is commonly referred to as a day of bad luck and horror, but before it was given this meaning it was actually the day that celebrated feminine energy.
Before Christianity, the 13th was always considered the day of the Goddess, signified by how many times a woman would have her cycle in a year, roughly 13 times.
During the time of a woman's cycle she was said to have divine and magical powers. However, when society became more patriarchal women began to be shamed and the 13th became a negative thing.
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The number 13 also refers to how many times the moon cycles, commonly referred to as "female" by earth religions.
It also was celebrated as the day that honoured the cycle of creation, death and rebirth.
When Christianity came along, it was also decided that 13 was a bad luck number, Jesus' Last Supper being the reason - Jesus was the 13th person eating with the 12 Apostles. That's not to mention Friday being the day that Jesus was killed, Adam was kicked out of paradise and when Eve offered him the forbidden fruit.
So in reality, the 13th is actually a day of good luck for women and should be marked by celebrating Venus by wearing pink.