This is a lesson about the solar calendar.
Date and time are determined by the rotation of planet earth around the sun.
There are twelve months in a solar calendar year comprising 365 days, except every fourth year when there are 366 days. This is called a Leap year.
We follow the Gregorian Calendar today, the one which was corrected by Pope Gregory in 1582 following on from the Roman Julian Calendar first adopted by Julius Caesar.
The twelve months in the calendar year begin with January and end with December.
The number of days attributed to each month is not the same and is established by the rotation of the earth around the sun.
It takes 365 days for the earth to complete its orbit around the sun for a calendar year.
The months of January, March, May, July, August, October and December have thirty one days, whereas April, June, September and November have only thirty.
February is the odd month out as it has only twenty eight days, except every fourth year when it has an extra day. Then it is called a ‘leap year’.
Most of the months are named after Roman emperors. July, for example, is named after Julius Caesar and August after Emperor Augustus.
Actually, there were only ten months at first beginning with March.
The months of September, October, November and December are taken from 7 8 9 10 in Latin respectively.
The Romans, however, decided, to add January and February as two months at the beginning rather than the end of the year when Caesar established the Julian calendar.
The year is, of course, divided into fifty two weeks and each week comprises seven days.
Every day has twenty four hours.
Twelve is therefore also a significant number in the calculation of time as well as dates and how hours are shown on the face of a clock.
One hour is, of course, sixty minutes. The 360 degree circumference of a circle is divided into twelve 30 degree sub angles. Each 30 degree sub angle represents five minutes of time.


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