HTML Open Link in New Window

When I was looking at some webpage, there was a link to another page. I went to that link and after a while when I wanted to come back I had to click the back button for several times because the link opened in the existing window. But, if the link opened in a new window, it would have been better.

This is how it is done.

Say, your link points to Google. The html code would be

<a href="http://www.google.com">Google</a>

 ---------Test it------Google

Just change it to

<a href="http://www.google.com" target="_blank">Google</a>

---------Test it------Google

so that it opens in a new window

How to delete Files and Folders in Ubuntu

Even though how many times I have used some commands in Ubuntu, I just forget them sometimes.
The command rm is used to 'remove' stuff.

Here is how you would remove a file
sudo rm /media/disk/file.extension

Here is how you would remove a directory

sudo rm -rf /media/disk/directory

-r: recursive
So, all the directories and their contents inside the directory you mentioned will be recursively deleted.

-f: force
It will never prompt you for anything

Better Explained

I like to understand concepts or theories along with some real time applications. I will always think of a visual interpretation to go with it. Nevertheless, there are concepts, even though they are well established, still have not made clear sense to me or just confuses me time to time. For example, the complex number i, the Euler's number e have been mathematical abstractions even though I knew how to utilize them.
While searching for better explanations on the internet, I just found this site http://betterexplained.com/  and I am really loving it. If you are one of them just like me, hope this helps to clarify your doubts on the topics including math, programming, writing and communication.

Take Care!

How Seasons Change

I was born and I grew up in a country near the equator. So, we didn’t experience any seasonal change. Nevertheless, in the school, we learned how seasons occur. And, may be my teacher clearly explained that seasons happen because of the 23.5⁰ inclination of the Earth. But I had forgotten it and I thought it was because the planet Earth travels on an elliptical course.

After some thought and playing with a torch and a tennis ball, I understood again how this inclination causes seasons. I know most of you already know it but I’m sharing it. Let’s try to understand it by a diagram.

• First, let’s find out how summer in northern hemisphere and winter in southern hemisphere occur.

• Figure 1 gives you Earth’s travel around the Sun and figure 2 describes when the Earth is at a position like A of figure 1.
• A particular country in the northern hemisphere is drawn with a blue cross and another country in the southern hemisphere is drawn with a red cross. The country’s location changes when the Earth rotates around its own tilted axis and that’s why we have several blue crosses (and red crosses). Grey filling tells you that the cross is in darkness.
• The blue cross is in daylight more than it is in darkness. Three blue crosses and the two blue-grey filled crosses give away this information. Remember again; this is the same cross we are talking about at different times of the day. So, the length of day and night is not equal. As a result, for a given 24 hours, the blue cross receives more heat than what it can receive if the axis is not inclined. This is summer for northern hemisphere. On the other hand, the exact opposite happens in the southern hemisphere, which results in winter.

• Now, let’s see how spring and autumn occur.

• This time, the rays of Sun come perpendicular to the sheet, as if you are the Sun, looking at Earth. As you can see, now the inclination of the Earth does not affect the length of day in the two hemispheres. Thus, day and night are equal in length for both hemispheres. (five blue crosses in daylight and another five at the back in darkness)
• From figure 3, the position D is in the middle of the Earth’s transition from C to A. For northern hemisphere, this is from winter to summer, and for southern hemisphere, this is from summer to winter.
• So, we can assume that these two transitions would make the trees respond differently, giving you the two seasons of spring and autumn.
• [winter-dead trees] -> gradually start to receive more sunlight so the blossoms will come out: This is spring.
• [summer-grown leaves]-> gradually start to lose sunlight which eventually result is low energy synthesization from sunlight by the green chlorophyll pigment in all the plants. As there is not enough sunlight, not much chlorophyll is needed by the trees and when this pigment vanishes, the leaves turn red and yellow. Small amounts of these colors have been in the leaves all along. We just can't see them in the summer, because they are covered up by the green chlorophyll: This is autumn.
  

• Finally, now it is easy to figure out why countries near the equator do not experience any seasonal change.

 

• Again, the inclination of Earth does not affect the length of day and night for countries near the equator.

Thank you for reading this. Hope you enjoyed it!

Hello World!

Hello Everyone!


I started blogging because I like to share the things I understood. And, I want to try explaining them so that even my grandmother can understand. Speaking of which, Albert Einstein had once said that

you do not really understand something unless you can explain it to your grandmother

Hope you enjoy reading my blog.