There is a widespread belief that Friday the 13th is an unlucky day. In tradition, the number 13 is considered unlucky because there were 13 people present at the Last Supper (Jesus and the 12 apostles). In Norse mythology, the mischievous Loki, as the 13th guest, brought misfortune to the gods (the death of Balder). However, the negative connotations of the number 13 have even older roots, which can be found in Chaldean numerology.
Some take the connection between Friday and the number 13 even further, seeing it as representing the 13 lunar months. Both the Moon and Venus (the planet associated with Friday) are considered feminine planets. Based on this, the promotion of Friday the 13th as an unlucky day has been interpreted as a patriarchal attack on the feminine archetype and motherhood.
It’s also possible that the association between Friday the 13th and bad luck in Europe and the U.S. stems from the belief that Jesus died on Friday the 13th of Nisan. Regardless of the actual origin of the fear surrounding this day, we can explore what Chaldean numerology has to say about it. Some Chaldean numerologists warn that it is indeed a dangerous day because Friday is ruled by Venus, which corresponds to the number 6. In numerology, 6 and 13 (base number 4) are considered incompatible.
In reality, it’s difficult to definitively label Friday the 13th as either lucky or unlucky. Under certain conditions, there is even a possibility of favorable numerological interactions between the numbers 6 and 4. Besides 13 and 6, there are other numbers that influence a particular day. For example, the “Life Path” number of the specific day is also in play, along with several other numbers.

Additionally, the day of the week holds less significance than the day of the month. We are still dealing mainly with the 13th of the month. The relationship between the day of the week and the day of the month is not crucial for an individual (in predictions!). What’s more important are the interactions between one’s personal numbers and the day of the week, as well as the interactions between one’s numbers and the day of the month. For instance, If our two key numbers are 1 and 5, then Friday the 13th is more likely to have a positive influence, at least based on the basic factors. However, if we have only one key number and that number is 4, Friday the 13th may not be an ideal day.
On an individual level, there are several ways to determine the personal influences of a particular day. Some personalization techniques have a stronger influence than others. The personal impacts of the day are affected by the birth date numbers, and to a lesser extent, by name numbers.
So, is Friday the 13th an auspicious or inauspicious day for you? According to Chaldean numerology, this is an inappropriate or overly general question. Based on individual influences, Friday the 13th could be a lucky day, a neutral day, or a day that brings challenges. To such a broad question, only a general answer is possible.
