Determining which date is the day of the week

Abstract

This study is about determining which day of the week a day falls in history using mathematical equations. Various computer programs or some calendar tables have been prepared on this subject. This study aims to study mathematical equations covering all centuries after Christ. The Gregorian calendar used today was first used as the Julian calendar, and in 1582, it was determined that there was a small error in this Julian calendar. This error was corrected and the Gregorian calendar was created. The aim of this study is to find the equations that correspond to the days of the Julian and Gregorian calendars.