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Articles About Calendar (81)

Bahá'í Leap Year

The Bahá'í leap year occurs when five extra days are added between the last two months of the calendar. Leap years usually occur every four 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 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

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

The Ethiopian Leap Year

A leap year occurs every 4 years in the Ethiopian calendar when one extra day is added at the end of the year. more

February 30

February 30 actually existed at least twice in the past, according to historical records. 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

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

The Persian Leap Year

The Iranian or Persian calendar is one of the most accurate calendar systems ever devised. Find out what makes it so precise. more

Islamic Leap Year

A leap year in the tabular version of the Islamic Hijri calendar occurs 11 times in a 30-year cycle when one day is added to the last month of the year. more

Leap Day Birthdays

When do “leaplings” celebrate their birthdays – every year or only during leap years? more

Leap Year in Other Calendars

Most western countries use the Gregorian calendar, but some use other calendars. Some calendars even add a leap month instead of a leap day. more

What Is a Leap Year?

A leap year has 366 days, as opposed to a common year, which has 365. Nearly every four years is a Leap Year, and we add a leap day, an extra day on February 29. 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

Is There a Perfect Calendar?

Our calendar does not accurately reflect the length of a tropical year, the time it takes Earth to complete a full orbit around the Sun. Why is that so and are there other calendars that do a better job? more

Special Calendar Dates

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

The 823-Year Myth

5 Fridays, 5 Saturdays, and 5 Sundays in the same month happens only every 823 years? This popular urban myth is precisely that: a myth. more

The Chinese Calendar

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

The Ethiopian Calendar

The Ethiopian calendar is quite similar to the Julian calendar, which was the predecessor to the Gregorian calendar most countries use today. more

The Julian Calendar

The Julian calendar reformed the ancient Roman calendar and consists of three cycles of 365-day years followed by a 366-day leap year. Introduced by and named after Julius Caesar in 45 BCE. more

June Solstice

The June solstice is the longest day of the year in the Northern Hemisphere & the shortest day in the Southern Hemisphere. more

End of the world December 21, 2012?

The Mayan calendar ended one of its great cycles in December 2012, which has fueled countless predictions about the end of the world on December 21, 2012 at 11:11(UTC). more

The Mayan Calendar

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

The Revised Julian Calendar

The Revised Julian calendar is one of the most accurate calendar systems ever developed. How does it work, and why don't we use it? more

The Roman Calendar

The ancient Roman calendar, or “pre-Julian” calendar, is believed to have been a lunar calendar. more

A Year Is Never 365 Days

The definition of a tropical year is the time it takes the Earth to complete a full orbit around the Sun. It is approximately 365.242189 days long. more

Why Are There 7 Days in a Week?

It's Monday, you have to wait 5 days till the weekend. Why does a week have 7 days, and why in that order? Thank the Moon and an ancient people in today's Iraq. more

Friday Is the Fifth Day

Friday is the fifth day of the week, and the last day of the working week in most western countries. It is named after Norse fertility goddess Frigg. more

The Seven-Day Week

The 7-day week is the international standard that is used by the majority of the world. There are 52 or 53 weeks in a year, but countries vary on how they count the weeks. more

Long Weekend – Bank Holiday Weekend

A long weekend lasts at least three days because a Monday or a Friday is a (bank) holiday. A four-day bridge weekend is when a Thursday or Tuesday is a holiday and you also have the bridge day off to join it with the weekend. more

Monday: the Moon’s Day

Monday is the first day of the week according to the international standard, but in the US, Canada, and Japan it is the second day of the week. more

Saturday: Saturn's day

Saturday is the day of the week, and it is usually considered the sixth day of the week. Saturday is named after the ancient Roman god Saturn. more

Sunday: the Sun's Day

Sunday is the seventh day of the week according to the international standard. However, many countries count Sunday as the first day of the week. more

Thursday Is Thor's Day

Thursday is named after Thor, the hammer-wielding Norse god of thunder. It is the fourth day of the week between Wednesday and Friday. more

Wednesday: Odin's Day

Wednesday is the third day of the week, and it is named after Odin, the Norse allfather-god who sent his ravens to Earth to keep an eye on people. more

November: Beaver Moon

The Full Moon in November is named after beavers. It is also called Frost Moon and Mourning Moon, depending on the winter solstice. more

What Is a Black Moon?

It can be the 3rd New Moon in a season of 4 New Moons or the 2nd New Moon in the same month or even no New Moon at all. more

December: Cold Moon

The December Full Moon is called the Cold Moon, Long Nights Moon, the Moon before Yule, Oak Moon, while a Celtic name was Wolf Moon. more

First Quarter Moon

The First Quarter Moon is a primary Moon phase when we can see exactly half of the Moon's surface illuminated. If it is the left or right half, depends on where you are on Earth. more

May: Flower Moon

The Full Moon in May is known as the Flower Moon. Other names include the Corn Planting Moon, and the Milk Moon, while some named it the Hare moon. more

Corn or Harvest Moon

The September Full Moon is usually the Harvest Moon, but this depends on the equinox. It is also called Full Corn Moon or Barley Moon. more

The Full Moon

The Full Moon is the moment the entire face of the Moon is illuminated by the Sun's rays. It is the 3rd primary phase. Each Full Moon has a name, except the Blue Moon. more

Full Moon Names

Full Moons had given names in many ancient cultures. The Full Moon names we use today often reflect nature like Harvest Moon. more

Harvest Moon in September

Harvest Moon is in September or October, the Full Moon nearest the autumnal (fall) equinox. 2017 Harvest Moon: October 5. Mid-Autumn Festival in China 中秋节; Vietnam Hong Kong and Taiwan. more

Hunter's Moon or Harvest Moon in October

Every third year, October’s Full Moon is the Harvest Moon. It also has several given names: Hunter’s Moon, Travel Moon, Dying Grass Moon, and sometimes Blood Moon or Sanguine Moon. more

The Lunar Month

A lunar month is the time it takes the Moon to pass through all of the Moon phases, usually measured from a New Moon the next New Moon. more

The New Moon

In modern astronomy, the New Moon is when the Sun and Moon are aligned, with the Sun and Earth on opposite sides of the Moon. The New Moon also has important cultural and religious significance worldwide. more

April: Pink Moon

Pink Moon comes from Pink Wild Ground Phlox which bloom in spring. Other names for this Full Moon are Sprouting Grass Moon, Fish Moon, Hare Moon, Egg Moon, and Paschal Moon. more

February: Snow Moon

The February Full Moon is named after the snow on the ground. Some Native American tribes named this the Hunger Moon, others called it the Storm Moon. more

June: Strawberry Moon

The wild strawberries that start to ripen during early summer gave name to the Full Moon in June. Other names are Rose Moon, Hot Moon, and Mead Moon. more

Sturgeon Moon

The Full Moon in August is named after the lake sturgeon. Other names for this Full Moon include Grain Moon, Green Corn Moon, Fruit Moon, and Barley Moon. more

Third Quarter Moon

The Third or Last Quarter Moon is when the opposite half of the Moon is illuminated compared to the First Quarter. more

Waning Crescent Moon

During the Waning Crescent Moon phase, the illuminated part of the Moon decreases from a semicircle at Third Quarter until it disappears from view entirely at New Moon. more

January: Wolf Moon

The January Full Moon is named after howling wolves. In some cultures, it was known as Old Moon, Ice Moon, Snow Moon, and the Moon after Yule. more

March: Worm Moon

The Full Moon in March is the Worm Moon. It is also called Lenten Moon, Crow Moon, Crust Moon, Chaste Moon, Sugar Moon, and Sap Moon. more

The Month of April

April is the fourth month of the year in the Gregorian calendar, and is named after the Greek goddess Aphrodite. 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 Month of February

February is the second month of the year in the Gregorian calendar. It is the shortest month with only 28 days in common years and 29 days in leap years. more

The Month of May

May is the fifth month of the year in the Gregorian calendar and named after the Greek godess Maia. 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

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