## A NUMBER MAKES YOU AN ASTROLOGIST, by SURATH ROY, DEPARMENT OF MATHEMATICS

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Given below is a **SURATH ROY’s** number that can help us deduce the day of the week from any given date between 1900 and 2099.

Use the following data as your** value of the month**:

**JAN FEB MAR APR MAY JUN JULY AUG SEP OCT NOV DEC**

Non leap year 1 4 4 0 2 5 0 3 6 1 4 6

Leap year 0 3 4 0 2 5 0 3 6 1 4 6

**Value the year** from **1900** to **1999** =00

**Value the year **from **2000** to **2099** =06

How do you find out the day from a given data?

1) First you put the **value of the year** **:**

2) Then you put the **value of the month** **:**

3) Then you put the last two digit of the year **:**

4) Next you put the quotient arrived by dividing

the last two digit of the year by 4 (ignore the reminder) **:**

5) Last step is to put the date **: **

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**Total :**

You divide the above total by 7.The remainder obtained will answer of your question –

## If it is 1, the day will be Sunday

## If it is2, the day will be Monday

## If it is 3, the day will be Tuesday

## If it is 4, the day will be Wednesday

## If it is 5, the day will be Thursday

## If it is 6, the day will be Fri day

**If it is 0, the day will be Saturday**

**Example 1**: Find the day of 23^{rd} February of the year 1983.

Ans: 1) First you put the **value of the year** **: 00**

2) Then you put the **value of the month** **: 04**

3) Then you put the last two digit of the year **: 83**

4) Next you put the quotient arrived by dividing

the last two digit of the year by 4 (ignore the reminder) **: 20**

5) Last step is to put the date **: ** **23**

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**Total : 130**

When , Remainder=4

Hence the day was: **Wednesday.**

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** Example 2**: Find the day of 30^{th} January of the year 2016.

Ans: 1) First you put the **value of the year** **: 06**

2) Then you put the **value of the month** **: 00**

3) Then you put the last two digit of the year **: 16**

4) Next you put the quotient arrived by dividing

the last two digit of the year by 4 (ignore the reminder) **: 04**

5) Last step is to put the date **: ** **30**

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**Total : 56**

When , Remainder=0

Hence the day was: **Saturday.**

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