Number 4 in Calendar

A page of the Numeropedia - the Special Encyclopedia of Numbers

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Number 4 in Calendar       Number 4 in Flags             Number 4 in Geology      Number 4 in Gov. & History     

Number 4 in Math           Number 4 in Measurements         Number 4 in Science           Number 4 in Sports   

Number 4 in Technology               Number 4 in Trivia        Number 4                      (More Calendar pages)


 April’s birthstone is diamond (for innocence). 

 April’s flower is daisy or sweet pea.

April’s full moon is named “Pink Moon”.

 

The years divisible by 4 but not by 100 are leap years. The years divisible by 100 are not leap years, unless they are also divisible by 400 in which case they are leap years, following the adoption of the current Gregorian calendar, created by Pope Gregory XIII in 1582 to reform the old Julian calendar.

 

The number of 30-day months in a (solar) year: April, June, September and November.

 

The number of main seasons in a year: Spring, Summer, Fall (Autumn) and Winter.

 

The number of weeks (plus 0, 1, 2 or 3 days) in a month.

 

The maximum number of complete (full) weeks in a month.

 

The year 4 A.D. was not a leap year, to correct the past mistakes, having leap years for every three years (since the year 45 B.C. to 9 B.C.) instead of 4 years as decreed by Julius Caesar in 46 B.C.

 

The years (from 1000 to 9999) are commonly written in either full 4 digits or last 2 digits.