There are 13 bloodlines within the Illuminati.

The occult calendar are comprised of 13 weeks.

They recognize these 13 periods like we do holidays.

Feb 2nd we recognize as Ground's Day.

They recognize Feb 1&2 as a Human Sacrifice Nights.

https:// www.bibliotecapleyades.net/cienciareal/cienciareal20.htm

http:// www.lovethetruth.com/books/13_bloodlines/toc.htm