# How Was The Speed Of Light Detected?

## It takes about 8 minutes and 20 seconds for light to come from the sun to the earth. The speed of light is many, but not infinite. How was the speed of light first revealed?

The sun shines like a fireplace in the summer sky, looking for shade to survive. In the cold of winter, we stand in the light of that sun and look forward to sunbathing. Many people know that if the sun is turned off by pressing a switch like a lamp, then the people of the world will need to know that for exactly 6 minutes. This means that the side of the earth where the sun was shining will be illuminated for another 8 minutes. To many, the matter comes as a shock. Nothing like that happens in daily life. As soon as the light is turned on, the light comes on immediately. When the light goes out, it doesn't go out after 7 minutes. So, why would the sunlight do such a deception? The answer is simple - it takes about 8 minutes and 20 seconds for light to come from the sun to the earth. The speed of light is many, but not infinite. How was the speed of light first revealed? Who did?

Let's play a game before answering. Tell me, in what year (or in what century) was the speed of light invented? When I talk to kids, I ask them some questions. They think that most of these complex questions have been solved in the last century, or at least in the nineteenth century. It's funny when older people think the same thing after spending more than half of their lives. However, the answer to this question is in the seventeenth century, in 1676. Let's see the answer to this question - how the speed of light was calculated! I will not go into any complicated calculations. I will just try to tell the story.
Everything in the universe obeys the rules. For example, the earth rotates on its own axis once every 24 hours. This is why there is day and night in 24 hours. Sometimes 26 hours or sometimes 22 hours, it doesn’t happen. How to see the Earth's orbit, why - Mr. Newton observed these rules and gave some of the best formulas. Gravity was beautifully explained by them - how, at what speed, for how long an object with an ‘X’ mass would revolve around an object with a ‘Y’ mass, these could be calculated much more precisely than before. For example, the exact location of the Earth's orbit at any given time could be accurately calculated.

The circle was formed with the moon of Jupiter, more specifically with the (multiple) orbits of the moons. Mr. Newton's calculations say that the moons can be seen from the earth at a certain time when the moons revolve around Jupiter. But in reality, things are not happening that way. Sometimes it comes on time, sometimes it comes 6 minutes ahead of time, sometimes it comes 6 minutes later. What did Newton guy do wrong then?

The Danish astronomer Ole Rømer saw in 1676 that another piece of information needed to be added to the story. The moons are seen ahead of schedule (i.e., calculated time) when Jupiter moves closer to Earth as it rotates. And it comes after the schedule when Jupiter is farther away from Earth. He made the original observations of a lunar eclipse of Jupiter's moon Io. At that time he made a strange claim - it takes a while for the event to reach the earth from where it happened. From the calculation of how long it would take to stay away, he made a proposal to raise the eyebrows of every one of that era - the speed of the light thing is not infinite, it also has a speed. And that speed is 2 lakh 20 thousand kilometers per second. For those who know the actual speed (3 million kilometers per second), let me tell you before you start shouting, the light must not have been moving at a different speed then. His claim was 26% lower than the actual speed. Because straight up, he did something wrong as well. It would not be right to say wrong. In fact, he did as much as he could with the equipment he had at that time. Since then the sensitivity of the instrument has gradually increased, becoming more perfect. And we also got a fine calculation of the speed of light.

I am concluding by saying two things about the scientist who made this discovery for the first time. Ole Rømer was born on September 25, 1644, in Copenhagen, Denmark. He is the inventor of the modern thermometer. Not only that, but Daniel Gabriel Fahrenheit made the Fahrenheit scale a little better by improving his scale. Anyone who has read the "Flash" comics or watched the series knows that the Flash guy runs very fast. In the old comics, he measured his speed several times with the Réaumur scale, in memory of Ole Rømer.