Common year starting on Friday has only one Friday the 13th; The only Friday the 13th in this common year occurs in August. Leap years starting on Thursday share this characteristic, but also have another one in February. This is the only year type where the "n"th "Doomsday" (this year Sunday) is not in ISO week "n"; it is in ISO week "n"-1. In the (currently used) Gregorian calendar, the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-three common years per cycle or exactly 10.75% start on a Friday. The 28-year sub-cycle does only span across century
Ginny (Friday the 13th) first literary appearance in the novelization of "Friday the 13th Part 3" (1982), which states that she is in "serious condition" and is suffering from "severe hysterical shock: because of her battle with Jason Voorhees. She subsequently appears as the lead protagonist in "Friday the 13th Part II: A Novel", a novelization of the 1981 film "Friday the 13th Part 2", which was released seven years after the film premiered in February 1988. The novel was written by Simon Hawke and based on Ron Kurz's screenplay. The aftermath of her encounter with Jason is once again referenced in the novel