Skip to main content

Twinkling Stars

Why do Stars Twinkle ?

Out in space, stars do not twinkle. It is only when you look at them from Earth that they appear to do so. Stars are really very large but they are so far away from us that they seem to be just points of light. 
     Starlight comes towards Earth along a path through space that produces very little change in the light. However on Earth we see stars by looking through our planet's atmosphere, which is a thin shell of gases surrounding
our planet. The Earth's atmosphere is in constant motion, with pockets of hot and cold air moving around constantly. Light rays bend differently in cold air and hot air. The motion of hot and cold air pockets causes the light rays from a star to move continuously too. In addition, the pockets of moving air also focus and defocus the starlight, so that its brightness keeps changing. Both of these effects together produce the sensation that we call 'twinkling' of stars. 

Comments

Popular posts from this blog

Complement of a Number

Subtraction of Binary Numbers  ;  Octal and Hexadecimal Number  ;  Convert Decimal to Binary Complements Complements are used in digital computers for simplifying the subtraction operation and for logical manipulations. There are two types of complements for each base-r system: (1) the r’s complement and (2) the (r-1)’s complement. When the value of the base is substituted, the two types receive the names 2’s and 1’s complement for binary numbers,  10’s and 9’s complement for decimal numbers. The r’s Complement Given a positive number N in base r with an integer part of n digits, the r’s complement of N is defined as r n   - N for N is not equal to 0 and 0 for N = 0. The following numerical example will help clarify the definition. The 10’s complement of (52520) 10 is 10 5 – 52520 = 47480 The number of digits in the number is n= 5 The 10’s complement of (0.3267) 10 is 1 – 0.3267 = 0.6733 No integer part, so 10 n = 10 0 = 1 The 10’s...

Rules of divisibility part -1

Rules of divisibility In Vedic mathematics, it can be determined whether any part of any other number can be given completely without dividing it by several methods. These methods are based on the law of divisibility. By using these rules, calculations related to factors, parts etc. are simplified. Law of divisibility by number 2 :- If unit digit of given number is divisible by 2 then the given number is divisible by 2 also.                                                                 or  If unit digit of given number is 0,2,4,6 or 8 , then given number is divisible by 2. Example :- 10 ,32 ,74 ,108 ,2058 etc. Law of divisibility by number 3 :- If the sum of digits of given number is divisible by 3, then the number is divisible by 3 also. Illustration 1:-  In 546532 sum of digits=5+4+6+5+3+2=25 25 is not divisible...

Octal and Hexadecimal Number

Complement of a Number    Types of Number system    Convert Decimal to Binary If you are new to this article, I strongly recommend to read our previous article before preceding this. In our previous article, we had already seen that binary number has a base of 2. It means that binary number contains 2 1 = 2 combinations which are 0 and 1. Similarly, Octal and Hexadecimal number has a fixed number of combinations. As we earlier know that octal has a base 8, then it contains 8 digits through 0 to 7 which means 2 3 =8 combinations and Hexadecimal has a base 16 which means it has 2 4 =16 combinations.                 If you are focusing on a sequence i.e. octal, hexadecimal. They are the combinations of increasing power of 2. Octal – 2 3 , Hexadecimal - 2 4 This power indicates how many bits are in a number for a particular number system Octal has 3 bits Hexadecimal has 4 bits T...