HOW TO FIND THE DAY OF YOUR BIRTH-DATE?

The great German mathematician Karl Fredrich Gauss devised a beautifully simple formula in 1800 to calculate the day of the week corresponding to any date.

N = D +E+F+G+(G/4)
Day of week = N mod 7.

Let us understand the formula with an example. I want to find the day for the date "15 September 1959".

Step 1. D = Day of the month - Here it is '15'

2. E = a number allotted by Friedrich for each month
Month E
Jan 1 0
Feb 2 3
Mar 3 2
Apr 4 5
May 5 0
June 6 3
July 7 5
Aug 8 1
Sep 9 4
Oct 10 6
Nov 11 2
Dec 12 4
in our case E = 4

3. Next F : Divide the century by 4 , if reminders are 0,1,2,3, Then
F = 0,5,3,1 respectively
our case : 19/4 reminder is 3, so F=1

4. G: Last two digits of the year =59

5. (G/4) tells: divide G by 4 and take only whole number of the answer. Hence 59/4=14.

Now putting everything together in the formula , N= D+E+F+G+(G/4)
6. N= 15 +4+1+59+14 =93
Day = 93 Mod 7
That is divide 93 by 7 and take the reminder it is 2
second day of week. It is Tuesday!
Got it finally

Also cross-checked using the website "Timeanddate.com".(May be, this is algorithm used in the site also). You can find out day of the next new year. Hope, it does not fall on a Sunday.
Let us appreciate the genius Karl Friedrich.
------------------------------------------

Comments

DISORDER IS THE "ORDER OF THE DAY"

Imagine a balloon full of air. The air molecules are moving randomly inside the balloon. Let us pierce the balloon with a pin. The air rushes out. Why should not the air molecules stay inside the balloon safely and ignore the little hole? That is not the way the world works. The molecules always "want to occupy as many states as possible". Hence the air goes out in the open to occupy more volume. The things always goes into disorder (entropy) and the disorder increases with time. The above statement is what we call "second law of thermodynamics". Consider a cup of coffee on the table. Suppose the heat from entire room flows to your cup of coffee, the coffee will boil and the rest of the room will freeze. Freezing means bringing things to order and arrangement. It violates the second law. Hence it will never happen. Hence heat must flow from high ...

THE EARTH, A SUPER ORGANISM

JOIN MY COURSE: "Become a programmer in a day with python" A man called 'love lock' (what a name) proposed a theory called Gaia theory, named after Greek Goddess. It says, "Earth is a self-regulating organism like a human being. The organic life in it interacts with in-organic matter and maintains atmosphere, temperature and environment". Hence the earth is still suitable for the life to thrive. Imagine, in a particular place, there are lot of flowers. Some flowers are white and some are darkly coloured. We know, white reflects light and heat while dark absorbs the same. White flowers can thrive in hot climate. But dark flowers requires cold climate. The absorption and reflection balances and the environment reaches average, warm temperature at which both the flowers can co-exist. This is the essence of "Gaia" theory. On our earth, ...

THE WORK HORSE "="

One cannot think of a mathematical step without 'is equal to ' . It balances right hand side and left hand side. It aids simplification and manipulation of a mathematical expression. example: 2(A+B) = C 2A+2B = C 2A = C-2B A = C-2B/ 2 In an electronic calculator, the pressing of ' = " sign executes an asthmatic expression or simply calculates. In computer languages, it plays very important role. A = B When a computer looks at this expression, the value stored in the location named B is just transferred to the storage named A . After execution both A and B will have the same value an...

sciencecapsules

Search This Blog