How speed of light was calculated?🤔

 Hello Readers,

Welcome to my blog,

The speed of light is one of the most important constants in physics. It's also one of the most mysterious.

Have you ever wonder that how the speed of light got its value we used to study today, Which is  299,792,458 m/s or simply 3 lakhs km/ hr.

                                                        But how it was calculated?

Many physicists believe that the speed of light can be calculated from natural constants. The theory was proposed by Albert Einstein (1879–1955) and is known as the special theory of relativity.

In 1676, the Danish astronomer Ole Roemer (1644–1710) became the first person to measure the speed of light. However, He used cosmic horizon to do this or simply used the moon to do calculations.🙄

I know, It's a bit confusing. But You just understand that the time difference the Jupiter's moon (JO) take when it was closest and farthest from Jupiter respectively, And divided by the earth radius.

After that also it was having lots of conflicts like it is infinite people say it is not possible. A scientist named Galileo (1610) Founded Jupitar, while a Dutch scientist Christiaan Huygens found a value for the speed of light equivalent to 131,000 miles per second. The correct value is 186,000 miles per second. The difference was due to errors in Roemer’s estimate for the maximum time delay. Roemer’s data provided the first quantitative estimate for the speed of light, and it was in the right ballpark. This is how he became the first person to measure the speed of light.

And thus speed of light (c) is being given the value as 3x10^8 m/s for calculations in Physics and astronomy.

Thanks for reading,
Have a nice day.