Tuesday’s Google Doodle celebrates the 434th anniversary of the Gregorian calendar, which was introduced on Oct. 4, 1582, by Pope Gregory XIII. The new calendar, introduced during the ...

The sun sets behind the dome of St. Peter’s Basilica, in Rome, on Feb. 20, 2023. Pope Gregory XIII, the 16th century pontiff responsible for what is today known as the Gregorian calendar, now ...

Solar calendars track the position of the sun in the sky and are used by much of the world today in the form of the Gregorian Calendar. Lunar calendars track the phases of the moon.

Under the Gregorian calendar, the scheduling of the days for holidays, sporting events, and school schedules—to name but a few—must be redone each year. What a waste of time and money.