Skip to main content

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

Popular posts from this blog

Your heart -you do not know

  Size and Location: The human heart is roughly the size of a clenched fist and is located slightly to the left of the center of the chest. Despite its relatively small size, the heart plays a crucial role in pumping blood throughout the entire body. Heartbeat Variability: The heart does not beat at a constant rate. The interval between heartbeats can vary, and this variability is considered a sign of a healthy heart. Factors such as breathing, emotions, and physical activity influence the heartbeat. Electrical Conduction: The heart's contractions are controlled by electrical impulses. The sinoatrial (SA) node, often called the "natural pacemaker," generates electrical signals that regulate the heartbeat and coordinate the pumping of blood. Blood Pumping Capacity: On average, the human heart pumps about 2,000 gallons (or 7,570 liters) of blood each day. Over a lifetime, this amounts to pumping enough blood to fill several Olympic-sized swimming pools. Heart Chambers and V...

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...

How does your smart phone detect motion, steps, rotation, and location?

 How it works-1  An accelerometer in a smartphone is a microelectromechanical system (MEMS) device that measures acceleration and tilt. It works by detecting changes in motion by measuring the vibration or acceleration of the device. The accelerometer consists of a small mass suspended on a spring inside a sealed chamber. When the device is subjected to acceleration, the mass moves relative to the device, causing a change in capacitance that can be measured and processed by the smartphone's hardware. The accelerometer measures acceleration in three dimensions (x, y, and z) and provides data that the smartphone's software can use to determine the device's orientation, detect motion, and track changes in velocity and acceleration. The accelerometer is used for a variety of purposes in a smartphone, including screen rotation, motion tracking for games and fitness apps, and detecting the position of the device for navigation and location services. Additionally, it can be used t...