Although many references say that the "Julian" in "Julian Period" refers to Scaliger's father, Julius Scaliger, in the introduction to Book V of his "Opus de Emendatione Temporum" ("Work on the Emendation of Time") he states, ""Iulianum vocavimus: quia ad annum Iulianum dumtaxat accomodata est"", which translates more or less as "We have called it Julian merely because it is accommodated to the Julian year.
Note: although many references say that the Julian in "Julian day" refers to Scaliger's father, Julius Scaliger , in the introduction to Book V of his Opus de Emendatione Temporum ("Work on the Emendation of Time") he states, " Iulianum vocavimus: quia ad annum Iulianum dumtaxat accomodata est ", which translates more or less as "We have called it Julian merely because it is accommodated to the Julian year.