The Gregorian calendar

The Gregorian calendar

Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is the most widely used calendar.

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Geography

Keywords

Gregorian, gregorián naptár, XIII. Gergely pápa, measuring time, calendar, szökőév, astronomy, day, time, religion, orbital period around the Sun, Earth, year, Pope, technology, nature, geography

On-screen labels

Sun, perihelion, aphelion, The orbital speed of the Earth around the Sun: 30 km/s, The orbital period around the Sun: 1 year, 365 days 5 hours, 48 minutes 46 seconds, Over 4 years, 23 hours 15 minutes 4 seconds, Every year divisible by 4 is a leap year., If a year is divisible by 100: not a leap year., If a year is divisible by 400: leap year., January 1, 2013, January 1, 4582, The current calendar: since 1582, Pope Gregory XIII (1502-1585), known for his reformation of the calendar in 1582
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