Ancient Tamilans Clock

Here am sharing some information about how ancient people find time using sunlight at day time. Tamilans lived based on nature. So they calculate time using sounds of birds in early morning and stars at night.Now we see how they calculate time using sunlight shade.
 This technology taken from the temple which was constructed by pallava king in 10th century.

The way to find time:
  Take a paper, draw a semicircle and note the center point. Draw the baseline and another line perpendicular to the base line and it divide the semicircle into two halves. In the flat line mark both sides with 6 o clock. Mark two symbols one with sun and another one with moon. Mark centre line 12 o clock.
Ie) Sun usually rises at 6 in our country. From morning 6 to evening 6, noon 12 o clock divide the day into two equal parts.

From 6 to 12 o clock we have to draw 5 lines equally, in the half of the semi circle and named it as 7,8,9,10 and 11. And the second half of the semi circle draw 5 lines and  named it as 1,2,3,4 and 5. The numbers in the semicircle indicates 1 to 12 o clock. Join all the numbers from the centre point and make sure the distance between adjacent lines should be same. If accurate minutes need to be calculate draw 3 lines with same distance between an hour.

    Put one hole in the centre point and place one straight stick there.  Place the clock where the morning 6 o clock should point out where the sunrises.(shadow should fall in the morning 6 o clock)

  If you place clock in this direction, when suntravels and if your stick is straight the shadow of line falls in the hour of clock.

Thank you!!!

Introduction about Submarine

What is Submarine?
  A submarine is a watercraft capable of independent operation under water.It differ from a submersible which has more limited underwater capability.  
Invention:
  Submarines invented by Cornelia drebbel Dutch poly math. Its made up of wood and leather covered with Greece. The first country which used submarines for military purpose is america. It was designed during 19th century. It consists of cylindrical body with hemispherical ends and a vertical structure.
     Submarines mainly used for military purpose like attacking enemy surface ships, aircraft protection, land attack etc. It is also used to study marine science, salvage, exploration facility inspection, technology and under sea archaeology.

How submarines works? 
  When the submarine surfaces compressed air flows from the air flasks into the ballast tanks and the water is forced out of the submarine until it's overall density is less than the surrounding water and the submarine rises.
Ie in simple terms: when the water is filled in the ballast tank submarine weight increased and it slowly immersed in water.when water starts to going out the tank will fill with air and submarine starts to coming up.
Now a days submarines used nuclear power to work.because if it is worked based on diesel/petrol air is mandatory. So now a days nuclear power is used as fuel.
Electrolysis:
    Water consists of oxygen and hydrogen. Through electrolysis oxygen is separated and it's used for human lives.Food is preserved for atleast 6 months.
Periscope: 
It is the eyes of submarine. It shows the route to the captain with 360 degree angle.
Red colour light is used inside the submarine. While using red colour then easy to see dark also. After using white colour our eyes are not visible at dark. 
Thank you!!!

Anne Frank

Anne Frank was a German born Dutch Jewish girl. She was born in 12th June 1929. She born in germany, world war 2 was started at that time. So at the age of 4, they moved to amsterdam; Netherland.

    After that nazis occupied Netherlands also. Due to Jewish population, Nazis hate them and started to fight against them. So they plan to move switch Switcherland. But can't able to move. So Anne's family hide in one secret room in their father's office. Miep gies Otto frank( Anne's father)  secretary help them and feed them.

   On 13th birthday Anne father gave her a diary. She started to write her own feeling in that diary and she named her diary as kitty.
  Unfortunately they caught by Nazis army and they bring them to Bergen- Belsen concentration camp. In their anne, her mom and her sister died. Anne and her sister died because of virus typhus.
 Once war over Anne's father came back. His secretary Miep gies give him Anne's diary. He published that diary with the help of government. Now the diary published in 70 languages and 30 million copies.

 Some of her diary quotes:

Human greatness does not lie in wealth or power, but in character & goodness. People are just people, and all people have fault and short coming; but all of us are born with a basic goodness.

    I don't want to have lived in vain like most people. I want to be useful or bring enjoyment to all people, even those I've never met. I want to go on living even after my death!

  Where there's hope there's life. It fills us with fresh courage and makes us strong again.

     It's wonder I haven't abandoned all my ideals, they seem so absurd and impractical. Yet I keep to them because I still believe " In spite of everything that people are truly goo at heart."
 Everyone has inside of him a piece of good news. The good news is that you don't know how great you can be! How much you can love! What you can accomplish and what your potential is!!
Thank you!!