100 Random Fun Facts about the Calendar

We’ve created this list of 100 random fun facts about the calendar for your enjoyment and for you to share with friends!

Random Fun Facts 1-25
Random Fun Facts 25-50
Random Run Facts 51-75
Random Run Facts 76-100

Random Fun Facts about the Calendar 1-25

Here are 25 random fun facts about the calendar:

The Gregorian calendar, which is the calendar used by most of the world today, was introduced by Pope Gregory XIII in 1582.
The Gregorian calendar is a solar calendar, which means it is based on the movement of the sun.
The Gregorian calendar has 365 days in a year, with an additional day added every 4 years, known as a leap year.
The Julian calendar, which preceded the Gregorian calendar, had 365.25 days in a year, which meant that it lost time over the centuries.
The Islamic calendar is a lunar calendar, which means it is based on the cycles of the moon.
The Islamic calendar has 12 lunar months, which means that it is 11 days shorter than the Gregorian calendar.
The Chinese calendar is also a lunar calendar, which means that it is based on the cycles of the moon.
The Chinese calendar is based on a 60-year cycle, with each year represented by an animal.
The Hebrew calendar is a lunisolar calendar, which means it is based on the cycles of the moon and the movement of the sun.
The Hebrew calendar has 12 lunar months, with an additional month added every few years to keep the calendar aligned with the solar year.
The Maya calendar is a complex system of calendars that was used by the ancient Maya civilization in Mesoamerica.
The Maya calendar consisted of three calendars: the Tzolkin, the Haab, and the Long Count.
The Tzolkin calendar had 260 days and was used for divination and religious ceremonies.
The Haab calendar had 365 days and was used for agriculture and the timing of festivals.
The Long Count calendar was used to track longer periods of time and was based on a cycle of 5,125 years.
The Julian calendar was named after Julius Caesar, who introduced it in 45 BCE.
The Julian calendar was used for over 1500 years, until it was replaced by the Gregorian calendar.
The Gregorian calendar was named after Pope Gregory XIII, who introduced it in 1582.
The Mayan Long Count calendar was believed to have started on August 11th, 3114 BCE.
The Ethiopian calendar is based on the Coptic calendar, which is a variant of the ancient Egyptian calendar.
The Ethiopian calendar has 13 months, with the 13th month having only 5 or 6 days depending on whether it is a leap year.
The French Republican calendar was introduced in 1793 during the French Revolution and had 12 months, each with 3 weeks of 10 days each.
The French Republican calendar was abolished in 1805, after the fall of Napoleon.
The International Fixed Calendar, proposed in 1923, had 13 months of 28 days each, with an additional “Year Day” at the end of the year.
The International Fixed Calendar was never widely adopted.

Random Fun Facts about the Calendar 26-50

Here are another 25 random fun facts about the calendar:

The Persian calendar, also known as the Solar Hijri calendar, is a solar calendar used in Iran and Afghanistan.
The Persian calendar has 12 months, with the first 6 months having 31 days and the last 6 months having 30 days.
The Persian calendar is also used as the official calendar of the Zoroastrian religion.
The Roman calendar, which was used in ancient Rome, was a lunar calendar with 10 months.
The Roman calendar was reformed by Julius Caesar in 45 BCE to include 12 months and to be based on the sun, with the addition of leap years.
The Hindu calendar, also known as the Vedic calendar, is a lunisolar calendar used in India and Nepal.
The Hindu calendar has 12 lunar months, with an additional intercalary month added in some years to align the calendar with the solar year.
The Hindu calendar is used to determine religious festivals and auspicious dates for ceremonies and events.
The Julian date is a continuous count of days since January 1, 4713 BCE, in the Julian calendar.
The Julian date is commonly used in astronomy, military, and scientific applications.
The Jewish calendar starts at sunset, rather than at midnight like the Gregorian calendar.
The Julian day number is a count of days since noon on January 1, 4713 BCE, in the proleptic Julian calendar.
The Julian day number is commonly used in astronomy and is a way to simplify date calculations.
The solar year, which is the time it takes for the Earth to complete one orbit around the sun, is approximately 365.24 days.
The Tropical year, which is the time it takes for the Earth to complete one orbit around the sun relative to the vernal equinox, is approximately 365.24 days.
The Sidereal year, which is the time it takes for the Earth to complete one orbit around the sun relative to the fixed stars, is approximately 365.26 days.
The Anno Domini (AD) system of dating, which is based on the birth of Jesus Christ, was introduced by the monk Dionysius Exiguus in the 6th century.
The Common Era (CE) system of dating is an alternative to the Anno Domini system, which does not use religious connotations.
The Mayan Long Count calendar ended on December 21, 2012, which was believed by some to be the end of the world, but in reality, it was simply the end of a cycle.
The Hebrew calendar is used to determine the date of Jewish holidays and is based on the lunar cycle.
The ancient Egyptians had a calendar based on the cycles of the Nile River, which consisted of 12 months of 30 days each, with an additional 5 or 6 “epagomenal” days added at the end of the year.
The Egyptian calendar was used for over 4,000 years, until it was replaced by the Coptic calendar.
The Islamic calendar is used to determine the date of Muslim holidays, such as Ramadan and Eid al-Fitr.
The Maya calendar is still used today by some indigenous communities in Mesoamerica for religious and cultural purposes.
The Chinese calendar is used to determine the date of Chinese holidays, such as Chinese New Year.

Random Fun Facts 51-75

Here are another 25 random fun facts about the calendar:

The Maya Long Count calendar has a cycle of 13 baktuns, which is equivalent to 5,125.36 years.
The French Revolutionary calendar had 10 days in a week, with each day named after a natural element, such as “Fire” and “Water.”
The French Revolutionary calendar also had months named after seasonal activities, such as “Harvest” and “Thermidor” (heat).
The International Fixed Calendar was proposed as a way to simplify business and financial transactions by having a standardized calendar.
The Persian calendar is used to determine the date of Nowruz, the Persian New Year.
The World Calendar, proposed in 1930, had a year of 52 weeks divided into four quarters, with each quarter having three months of 30 or 31 days.
The World Calendar also had an additional day called “Worldsday,” which was not part of any week or month and was used to align the calendar with the solar year.
The Balinese Pawukon calendar is used on the Indonesian island of Bali and is based on a 210-day cycle.
The Pawukon calendar has a complex system of intercalation, with some years having 10 months and others having 11.
The Ethiopian calendar has 13 months, with 12 months of 30 days each and an additional month of 5 or 6 days.
The Ethiopian calendar is 7-8 years behind the Gregorian calendar, due to a difference in the calculation of the date of the Annunciation.
The Armenian calendar is used by the Armenian Apostolic Church and has 12 months, with each month having 30 days.
The Armenian calendar also has an additional month of 5 or 6 days, which is added after the month of July.
The Armenian calendar is based on the Zoroastrian calendar, which was used in Persia before the spread of Islam.
The Bahá’í calendar is used by the Bahá’í Faith and has 19 months of 19 days each, with an additional period of 4 or 5 intercalary days.
The Bahá’í calendar also has a year of 365 days, with an additional day added in leap years.
The Solar Hijri calendar is used in Iran and Afghanistan and is based on the solar year.
The Solar Hijri calendar has 12 months, with each month having 29 or 30 days.
The Solar Hijri calendar also has an additional day added in leap years.
The Islamic calendar is a lunar calendar, which means that the months are based on the cycles of the moon.
The Islamic calendar has 12 lunar months, with the start of each month determined by the sighting of the new moon.
The Hijri year, which is used in the Islamic calendar, is approximately 11 days shorter than the solar year, which means that the dates of Islamic holidays shift by approximately 11 days each year.
The Chinese calendar is a lunisolar calendar, which means that it is based on both the cycles of the moon and the solar year.
The Chinese calendar has 12 lunar months, with the start of each month determined by the cycles of the moon.
The Chinese calendar also has an additional month added in some years to align the calendar with the solar year.

Random Fun Facts 76-100

Here are another 25 random fun facts about the calendar:

The Vietnamese calendar is also a lunisolar calendar, which is similar to the Chinese calendar.
The Vietnamese calendar has 12 lunar months, with the start of each month determined by the cycles of the moon.
The Vietnamese calendar also has an additional month added in some years to align the calendar with the solar year.
The Gregorian calendar, which is the most widely used calendar in the world, was introduced by Pope Gregory XIII in 1582 to reform the Julian calendar.
The Gregorian calendar has 365 days in a year, with an additional day added in leap years.
The Gregorian calendar is used by most countries in the world for civil purposes, such as the determination of holidays and the tracking of time.
The Julian calendar, which was used by the Roman Empire, had a year of 365.25 days, with an additional day added every four years in a leap year.
The Julian calendar, although accurate for its time, was slowly accumulating errors in its calculations. This led to the need for a calendar reform.
The Gregorian calendar, named after Pope Gregory XIII, was proposed to fix the inaccuracies of the Julian calendar.
In the Gregorian calendar, a leap year occurs every 4 years, except for years divisible by 100 but not by 400.
The Gregorian calendar is named after Pope Gregory XIII, who authorized its use by the Catholic Church in 1582.
The Gregorian calendar was adopted by many European countries in the following years and eventually became the most widely used calendar in the world.
The Julian calendar is still used by some Eastern Orthodox churches for religious purposes.
The Gregorian calendar was not adopted by Great Britain and its colonies until 1752, which led to a difference in the dates between Great Britain and the rest of Europe for some time.
The Gregorian calendar is not the only reform made to the Julian calendar. Other calendars have been proposed throughout history, such as the World Calendar and the Hanke-Henry Permanent Calendar.
Some countries, such as Israel and Saudi Arabia, use a different calendar for religious purposes, such as the Hebrew calendar and the Islamic calendar.
The Hebrew calendar is a lunisolar calendar, which means that it is based on both the cycles of the moon and the solar year.
The Hebrew calendar has 12 lunar months, with an additional month added in some years to align the calendar with the solar year.
The Islamic calendar is also a lunar calendar, which means that the months are based on the cycles of the moon.
The Islamic calendar has 12 lunar months, with the start of each month determined by the sighting of the new moon.
The Hindu calendar is also a lunisolar calendar, which is used in India and Nepal for religious purposes.
The Hindu calendar has 12 lunar months, with the start of each month determined by the cycles of the moon.
The Hindu calendar also has an additional month added in some years to align the calendar with the solar year.
The Mayan calendar, used by the Mayan civilization in Central America, had several different cycles, including a 260-day cycle and a Long Count cycle of over 5,000 years.
The Mayan calendar is still used by some indigenous groups in Guatemala and Mexico for religious purposes.