PDF chapter test TRY NOW

Ordinary year:

\(1\) year \(=\) \(12\) months

\(1\) year \(=\) \(52\) weeks \(+\) \(1\) day

\(1\) year \(=\) \(365\) days

\(1\) month \(=\) \(30\) days or \(31\) days

\(1\) month \(=\) \(4\) weeks \(+\) few days

\(1\) week \(=\) \(7\) days

Ordinary February month has \(28\) days.

Leap year:

\(1\) year \(=\) \(366\) days

\(1\) day is added in the month of February.

Important!

In a Leap year, February month has \(29\) days.

Leap year comes once in every four years.

Identifying a leap year:

A year which is divisible by \(4\) is a leap year.

A century which is divisible by \(400\) is a leap year.

Periods of time:

\(10\) years \(=\) \(1\) decade

\(100\) years \(=\) \(1\) century

\(1000\) years \(=\) \(1\) millennium

Jubilee:

A jubilee is a particular anniversary of an event.

\(25^{\text{th}}\) \(-\) Silver Jubilee

\(40^{\text{th}}\) \(-\) Ruby Jubilee

\(50^{\text{th}}\) \(-\) Golden Jubilee

\(60^{\text{th}}\) \(-\) Diamond Jubilee

\(65^{\text{th}}\) \(-\) Sapphire Jubilee

\(70^{\text{th}}\) \(-\) Platinum Jubilee

Important!

The study of measurement of time is called as "HOROLOGY".