Monday, 26 December 2016

Tuesday, 20 December 2016

Why There Are 24 Hours In A Day And 60 Minutes In An Hour?

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In recent years, what is one of the most common answers we give in response to any question we’re asked, request made of us, or suggestion of how we spend our time?
Obviously, it comes as no wonder that we never have TIME to ever think about the TIME we have? Not even the TIME we have, but the way we organize it! Confused? Let me clarify.
Have you ever wondered why the wristwatch strapped to your arm (assuming you still use one), your mobile screen, or any other damn clock in the world shows 12 numbers signifying 12 hours? Why isn’t it some other random number, like 28 or 16? What is the significance of twelve in our perception of time? I mean, if you give it any thought, you can’t deny that our measuring system is pretty weird. Allow me to explain:
  • 24 hours are divided into two parts – a day lasting 12 hours and a night lasting 12 hours
  • 1 hour contains 60 minutes, which also have 60 seconds each.
  • Each second is then divided into 1000 milliseconds.
Now, that seems like a rather strange way to divide a day. No wonder kids have trouble learning how to tell time! However, as always, like every other thing in the world, there is a reason behind this too.

The Impact of Civilization

In today’s world, we widely use the decimal number system, a system that is believed to have originated because it made it easy for us to count things on our fingers. Back then, when humans were still exploring the wonders of nature and finding answers to their countless questions, many other numerical systems were commonly used. The Egyptians and Babylonians, who first divided the day into smaller parts, used duodecimal (base 12) and sexagesimal (base 60) numeral systems.
That obviously begs the question – why base 12 and base 60? The reason is very simple, yet quite surprising!


Yes, believe it or not, the structure of our fingers is precisely the reason!  The number of finger joints on each hand (excluding the thumb) makes it possible to count to 12 by using the thumb. Surprised at what a simple explanation that is? Well, things are going to get slightly more complicated…

Why 24 hours?

Let’s try to understand this step-by-step. The 24-hour day concept comes from the ancient Egyptians. They divided the day into 10 hours with devices like shadow clocks and then added one hour at each end (one for twilight and one at the end of the day). Later, a T-shaped bar was made by Egyptians, which was calibrated to divide the time between sunrise and sunset into 12 parts.
However, the absence of sunlight made it difficult to divide the time at night. It’s pretty interesting to learn how they managed to do this. Yes, nighttime division of time was based on the observation of stars! In those ancient times, with no sophisticated technology to use, they instead chose 36 star groups (small constellations) called  ‘decans’, which rose consecutively on the horizon as the earth rotated. Each decan rose before sunrise and marked the beginning of a 10-day period. A total of 36 decans thus led to 36*10=360 days of a year. From one twilight to another, 18 of these decans were visible. However, each twilight period had 3 of these decans assigned, leaving 12 for the period of complete darkness (the duodecimal system is working here as well!). Thus, the rise of each decan marked an hour, so we ended up with 12 hours in each night.
However, at that time, the hours did not have a fixed length. The Greek astronomers who were then trying to find answers to the queries of the universe, existence, and stars and galaxies (in short… astronomers) found it difficult to manage calculations with the prevailing method. Then, Hipparchus gave us the “Equinoctial hours” by proposing the division of a day into 24 equal hours. Even then, for a long time, ordinary people kept using the seasonally varying hours. It wasn’t until the 14th century in Europe, when mechanical clocks came into use in Europe, that commoners began using the system that we practice to this day.

Why 60 Minutes and 60 Seconds?

The Greek astronomers who helped us make life simpler by equally dividing 24 hours followed the Babylonian’s sexagesimal (base 60) system for astronomical calculations. So, for convenience, they further divided an hour into 60 minutes and each minute into 60 seconds. It is unknown why the Babylonians used a base 60 system, but it may be because 60 is a special number for fraction calculations. It is the smallest number divisible by the first 6 counting numbers, and also by 10,12,15, 20 and 30.
The concept of milliseconds is quite modern, and since we use a base 10 system, each second is divided into 1000 milliseconds.
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Saturday, 10 December 2016

Types of arduino Boards

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ENTRY LEVEL
ARDUINO UNO

ARDUINO LEONARDO

ARDUINO 101

ARDUINO ROBOT

ARDUINO ESPLORA
ARDUINO MICRO

ARDUINO NANO

ARDUINO MINI

ARDUINO MKR2UNO ADAPTER
ARDUINO STARTER KIT

ARDUINO BASIC KIT

ARDUINO LCD SCREEN
ENHANCED FEATURES
ARDUINO MEGA

ARDUINO ZERO

ARDUINO DUE

ARDUINO MEGA ADK

ARDUINO PRO
ARDUINO PRO MINI

ARDUINO MOTOR SHIELD

ARDUINO USB HOST SHIELD

PROTO SHIELD
MKR PROTO SHIELD

MKR PROTO LARGE SHIELD

ARDUINO ISP

ARDUINO USB 2 SERIAL MICRO
ARDUINO MINI USB ADAPTER
INTERNET OF THINGS
ARDUINO YÚN

ARDUINO ETHERNET

ARDUINO MKR1000

ARDUINO WIFI SHIELD
ARDUINO WIFI 101 SHIELD

ARDUINO YÚN SHIELD

ARDUINO WIRELESS SD SHIELD
ARDUINO WIRELESS PROTO SHIELD

ARDUINO ETHERNET SHIELD V2

ARDUINO GSM SHIELD V2
MKR1000 BUNDLE
WEARABLE
ARDUINO GEMMA

LILYPAD ARDUINO USB

LILYPAD ARDUINO MAIN BOARD
LILYPAD ARDUINO SIMPLE

LILYPAD ARDUINO SIMPLE SNAP
3D PRINTING
MATERIA 101
BOARDS
MODULES
SHIELDS
KITS
ACCESSORIES
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Earth's North End and South End

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Have you ever wonder where is the end of earth? Everyone used compass,but anyone thinks how it work?Actually how many poles are there in earth?

Earth has a magnetic field. If you imagine a gigantic bar magnet inside of Earth, you'll have a pretty good idea what Earth's magnetic field is shaped like. Of course, Earth DOESN'T have a giant bar magnet inside it; instead, our planet's magnetic field is made by swirling motions of molten iron in Earth's outer core.

 Earth has two geographic poles: the North Pole and the South Pole. 
They are the places on Earth's surface that Earth's imaginary spin axis passes through. Our planet also has two magnetic poles: the North Magnetic Pole and the South Magnetic Pole. The magnetic poles are near, but not quite in the same places as, the geographic poles. The needle in a compass points towards a magnetic pole. When you are far away from a pole a compass is very helpful if you want to find your way around. The compass needle points pretty much due North (or South if you live in the Southern Hemisphere!). However, if you are near either pole, a compass becomes useless. It points towards the magnetic pole, not the true geographic pole. Those two poles could be quite far apart, and in different directions. Think how hard it must have been for early explorers to find their way around in the Arctic and Antarctic without being able to use a compass!

 Earth's magnetic field is tilted a little bit. If we pretend that Earth's magnetic field is made by a giant bar magnet, that bar magnet would make an angle with Earth's spin axis. That angle is about 11°. That's why the magnetic poles and the geographic poles are not in the same place. If you were standing at one of the magnetic poles, the magnetic field lines would be straight up and down. If you were holding a compass and turned it sideways, its needle would aim straight up and down!

 Earth's magnetic poles are actually pretty far from its geographic poles. In 2005, the North Magnetic Pole (NMP) was about 810 km (503 miles) from the Geographic North Pole. The NMP was in the Arctic Ocean north of Canada. The South Magnetic Pole (SMP) was about 2,826 km (1,756 miles) from the Geographic South Pole. The SMP was off the coast of Antarctica in the direction of Australia.

 Did you notice how we said where the magnetic poles were in 2005? Guess what; the magnetic poles actually move around! Remember, swirling motions of molten metal in Earth's outer core make our planet's magnetic field. Those swirling motions are changing all the time. That means the magnetic field is changing, so the magnetic poles move! In the first part of the 20th century, the poles usually moved about 9 km (5.6 miles) per year. Then, around 1970, they started moving faster. In recent years they have been moving about 41 km (25 miles) per year!

 Sometimes Earth's magnetic field even flips over! The North and South Magnetic Poles trade places. This doesn't happen very often; usually at least a few hundred thousand years pass between these flips.

 Speaking of flipping, did you know that Earth's North Magnetic Pole is actually a south pole? Huh, what? When compasses were first invented, people noticed that one end of the compass pointed towards the North. They called the end of the compass needle that pointed North the "north end" of the needle (makes sense!). Later, people learned more about magnets. They learned that like ends (a north and a north OR a south and a south) push away from each other. They learned that opposite ends (such as a north and a south) pull toward each other. The needle of a compass is a tiny bar magnet. The north end of the needle is pulled toward Earth's North Magnetic Pole. So the North Magnetic Pole is actually the south pole of Earth's magnetic field. Doesn't that just make your brain ache!
The aurora (Northern and Southern Lights) mostly happen near the magnetic poles. That's because the charged particles (mostly electrons and protons) that cause the aurora follow along magnetic field lines towards the magnetic poles. When the particles run into air in Earth's atmosphere, the air glows in pretty colors - making the beautiful aurora!
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Friday, 9 December 2016

Why is everything spherical ?

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Have you ever noticed that everything in space is a sphere? The Sun, the Earth, the Moon and the other planets and their moons… all spheres. Except for the stuff which isn’t spheres. What’s going on?
Have you noticed that a good portion of things in space are shaped like a sphere? Stars, planets, and moons are all spherical.
Why? It all comes down to gravity. All the atoms in an object pull towards a common center of gravity, and they’re resisted outwards by whatever force is holding them apart. The final result could be a sphere… but not always, as we’re about to learn.
Consider a glass of water. If you could see the individual molecules jostling around, you’d see them trying to fit in as snugly as they can, tension making the top of the water smooth and even.
Imagine a planet made entirely of water. If there were no winds, it would be perfectly smooth. The water molecules on the north pole are pulling towards the molecules on the south pole. The ones on the left are pulling towards the right. With all points pulling towards the center of the mass you would get a perfect sphere.
Gravity and surface tension pull it in, and molecular forces are pushing it outward. If you could hold this massive water droplet in an environment where it would remain undisturbed, eventually the water would reach a perfect balance. This is known as “hydrostatic equilibrium”.
Stars, planets and moons can be made of gas, ice or rock. Get enough mass in one area, and it’s going to pull all that stuff into a roughly spherical shape. Less massive objects, such as asteroids, comets, and smaller moons have less gravity, so they may not pull into perfect spheres.
As you know, most of the celestial bodies we’ve mentioned rotate on an axis, and guess what, those ones aren’t actually spheres either. The rapid rotation flattens out the middle, and makes them wider across the equator than from pole to pole. Earth is perfect example of this, and we call its shape an oblate spheroid.
Jupiter is even more flattened because it spins more rapidly. A day on Jupiter is a short 9.9 hours long. Which leaves it a distorted imperfect sphere at 71,500 km across the equator and just 66,900 from pole to pole.
Stars are similar. Our Sun rotates slowly, so it’s almost a perfect sphere, but there are stars out there that spin very, very quickly. VFTS 102, a giant star in the Tarantula nebula is spinning 100 times faster than the Sun. Any faster and it would tear itself apart from centripetal forces.
This oblate spheroid shape helps indicate why there are lots of flattened disks out there. This rapid spinning, where centripetal forces overcome gravitational attraction that creates this shape. You can see it in black hole accretion disks, solar systems, and galaxies.
Objects tend to form into spheres. If they’re massive enough, they’ll overcome the forces preventing it. But… if they’re spinning rapidly enough, they’ll flatten out all the way into disks.
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Why is Earth Round ?

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Don’t listen to the Flat Earth Society, they’re wrong; the Earth is round. But did you ever wonder why the Earth is round? It all comes down to gravity.
One of the effects of mass is that it attracts other mass. For small objects, like your computer, your car, and even a building, the force of gravity is tiny. But when you have millions, and even trillions of tonnes of mass, the effect of the gravity really builds up. All of the mass pulls on all the other mass, and it tries to create the most efficient shape… a sphere.
For smaller objects, like asteroids, the force of gravity trying to pull the object into a sphere isn’t enough to overcome the strength of the rock keeping it in shape. But once you get above a certain mass and size, the strength of the object can’t stop the force of gravity from pulling it into a sphere. Objects larger than about 1,000 km in size are able to pull themselves into a sphere.
In fact, the International Astronomical Union decided in 2006 that this ability was one of the requirements for an object to be considered a planet. They must orbit the Sun, they need to have cleared out all the smaller objects in their orbit, and they need to have enough gravity to pull themselves into a sphere.
When an object has the gravity to pull itself into a sphere, astronomers say that it’s in hydrostatic equilibrium. And that’s why the Earth is round.
Of course, the Earth isn’t perfectly round. Because it’s turning on its axis approximately once every 24 hours, the Earth’s equator bulges outwards. And there are mountains and valleys that make the Earth’s surface rough.

You may have the doubt like this :
While seeing the universe somewhere,you can imagine like everything was sphere. Is it so ?
Yeah,your doubt is correct.
 The answer goes here :  Why is everything spherical ?
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Friday, 2 December 2016

Block Particular Websites On Your PC

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Go to C:\Windows\System32\drivers\etc on your computer. Now, Copy the file to your desktop, open it with a notepad editor and add two lines in the bottom of the file.
127.0.0.1      www.websitename.com
127.0.0.1      websitename.com
Now, save it and copy and paste it back to etc folder.


No, one can open the website, unless you remove these two lines again.
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Google Search Tricks

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You Can Search Google Timer In Google For A Timer With Alarm





Search This In Google For Direct Mp3 Links

intitle:index.of?mp3 Your song name here



Use Your Chrome Browser As Notepad Quickly.




Just copy the text below to the address Bar.
data:text/html, <html contenteditable>
Note: You can also bookmark this to use it anytime.

Go To Google And Search Any Of The Texts Given Below And Peep Through Live Cameras Around The World

  • inurl:”CgiStart?page=”
  • inurl:/view.shtml* intitle:”Live View / — AXIS
  • inurl:view/view.shtml
  •  inurl:ViewerFrame?Mode=
  •  inurl:ViewerFrame?Mode=Refresh
  •  inurl:axis-cgi/jpg




Visit To See How Google View You  Http://Google.Com/Ads/Preferences


Rename Subtitle File Same As Movie Name And VLC Will Load Subtitle Automatically Every Time You Open Movie




Rename the subtitle file same as movie name (Kept in same folder) and you do not need to load subtitle everytime you play the movie.

In Your PC Just Create A Folder With The Name Given Below And Access Everything


GodMode.{ED7BA470-8E54-465E-825C-99712043E01C}




Visit Https://Www.Google.Com/Sky/ To Explore Space

Hack And Start Using  Airport Wi-Fi By Adding “?.Jpg” At The End Of Any URL


Delete One Word At One Time By CTRL+ Backspace



Bored ! Go To Google Images And Search Atari Breakout



Bored Again Search The Words Below In Google

  • do a barrel roll
  • tilt
  • Google in 1998
  • zerg rush
  • Pacman
  • blink html

Shake The Yotube By Searching Do The Harlem Shake On Youtube


Just Do Shift + Esc TO Start Chrome’s Inbuilt Task Manager



To Close A Tab Just Do A Middle Click On It.


 Open Task Manager  In Windows Directly Press Ctrl + Shift + Esc


Just Shake The Current Active Window By Mouse To Minimize Everything Else


To Capture Exact Steps , Windows Has A Free Screen Recorder For You, Search Psr In Your Computer







I know You use google daily. But Nothing wrong in taking a info dip to find out how many of the Google tips and tricks you know. These hidden google tips are the one which most people are unaware of. Here are a list of useful google searching tips as well as tips and tricks of Google products.

Search “Fun Facts” Or “I’m Feeling Curious” In Google And Feed Your Curiosity

Just search i’m feeling curious in google search Box and just keep clicking ask another question button  to unleash an endless spell of trivia from google.


Listen To Animal Sounds On Google, Just Search “Animal Sounds” On Google




See Your Search History , Go To Https://Www.Google.Com/History/

Only you as a logged in user can see your search data. You can also view, download and Delete Your search data here.
More useful Google URLs : –
  1. https://passwords.google.com – For viewing your stroed passwords in Google and Android
  2. https://maps.google.com/locationhistory –  For viewing your location history.
  3. https://security.google.com/settings/security/activity -For viewing your logging locations to find out if someone else is using your account or not.
  4. https://accounts.google.com/SignUpWithoutGmail – Create a Google account without creating a new gmail account.
  5. https://www.google.com/takeout – Export all of your Google data from Google servers including contacts, gmail messages, your videos from youtube etc.

See Your Location Timeline History On Google


Get Search Results From A Particular Website Only, Search Site:Website.Com Keyword




This is particularly useful if you want the search result from a single website only.

Search For  Keywords Within Quotes Lets You Search For That Exact Set Of Words In Exact Order



Search For Keyword 2010..2015 Search For Results In Range Of 2010 To 2015

Just separate two set of years with two dots and the results will be in that range. You can also pre append another keyword with this year range to get search results for that keyword on this particular range.

Google Around() Lets You Search For Two Set Of Keywords With Definite Keyword Distance



Now, in the search result the first keyword and second keyword will be separated by maximum 3 keywords.

Search This On Google To Discover An Interesting Shape

exp(-((x-4)^2+(y-4)^2)^2/1000) + exp(-((x +4)^2+(y+4)^2)^2/1000) + 0.1exp(-((x +4)^2+(y+4)^2)^2)+0.1exp(-((x -4)^2+(y-4)^2)^2

Explore Space Through Http://Www.Google.Com/Sky/

Search Flights In Google.Com/Flights

Be Creative With Legos On BuildwithChrome



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