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Articles about Calendar (52)

12 Months of the Year

The twelve months of the year are January, February, March, April, May, June, July, August, September, October, November and December. Each month has either 28, 30 or 31 days during the common year. more

The Chinese Calendar

The Chinese calendar is one of the oldest calendars in modern society. It is a lunisolar calendar. more

The Julian Calendar

The Julian calendar reformed the Pre-Julian Roman calendar and consists of three cycles of 365-day years followed by a 366-day leap year. more

The Mayan Calendar - an explanation

The Maya calendar consists of a system of three interlacing calendars and almanacs which was used by several cultures in Central America, most famously the Maya civilization. more

When is Spring Equinox?

The Vernal (Spring) Equinox in the Northern Hemisphere is in March. In the Southern Hemisphere it's in September. more

The Roman calendar

The Roman or “pre-Julian” calendar has changed several times between its creation during the founding of Rome and the fall of the Roman Empire. more

The Doomsday Algorithm

Some dates fall on the same weekday every year. Use this knowledge to calculate the weekday of any date in your head. more

Julian to the Gregorian Calendar

The Gregorian calendar was first introduced in 1582. Why are there some days missing in the calendar at that point? When was it adopted in different countries? more

Month of September

September is the ninth month of the year in the Gregorian calendar, but the name means 'seventh', as it was the seventh month in the ancient Roman Calendar. more

The Month of August

August is the eighth month of the year in the Gregorian calendar and is named after Augustus Caesar. more

The Doomsday Rule

Some dates fall on the same weekday every year. Use this knowledge to calculate the weekday of any given date in your head. more

Special Calendar Dates

Learn more about numerically unique calendar dates such as sequential dates, same number dates, and palindrome (reversible) dates more

40 New Years in 2016!

Toast the New Year 40 times with our new year countdown. 26 hours after the first bottle of bubbly pops on Kiritimati in the Pacific, Baker Island greets the New Year. more

Leap Day Birthdays and Events

A number of famous people were born on Leap Day. But how do leaplings celebrate their birthdays? And what is the world record for the number of children born on February 29? more

Friday the 13th

Friday the 13th, also known as Friday 13 or Friday the thirteenth, has been considered as a day of bad luck in various countries for many years. more

Chinese Leap Month

Instead of adding one Leap Day on February 29 nearly every four years, the Chinese add a Leap Month every 3 years to keep their calendar in line with the Earth's rotation. more

The Islamic leap year

A leap year in the the Islamic Hijri calendar occurs 11 times in a 30-year cycle, in which 1 day is added to the last month of the year. more

June solstice festivals

In many Northern Hemisphere cultures, the June solstice is associated with holidays, feasts and celebrations. more

The Hindu leap year

The Hindu leap year has an extra month and occurs once every 3 years or 4 times in 11 years. more

Friday – fifth day of the week

Friday is the fifth day of the week, between Thursday and Saturday, and the last day of the working week in most western countries that follow ISO 8601. Friday is named after the Norse fertility goddess Frigg. more

Ethiopian leap year

A leap year occurs once every 4 years in the Ethiopian calendar, in which 1 extra day is added at the end of the year. more

Palindrome Day

A Palindrome Day happens when the day’s date can be read the same way backwards and forwards. The dates are similar to word palindromes in that they are reversible. Depending on the date format Palindrome Days can be rare. more

12/12/12 Special Date

December, 12, 2012 or 12-12-12 was the last date of its kind - when all three numericals in a date are the same - for the next 88 years. The next time this will happen is on January 1, 2101, or 01-01-01. more

Leap Year in Other Calendars

In most western countries the Gregorian calendar is in use, but some cultures use other calendars. Some calendars even have a leap month instead of a leap day in a leap year. more

Bahá'í leap year

The Bahá'í leap year occurs when 1 extra day in the last month of the Bahá'í calendar, usually every 4 years. more

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