Rotation speed of Earth
A minute has 60 seconds, an hour 60 minutes and a day 24 hours. Facts. We have a sunrise a sunset and every 24 hours everything is reset. All true. So, what time does it take the earth to rotate? 24 hours? Wrong!
Earth needs only 23 hours, 56 minutes and 4,091 seconds to rotate. If it would take exactly 24 hours our days would shift. The difference between the rotation time and our 24 hour days is compensated by the 365,24636 days earth uses to turn around the sun (that’s why we have a leap year every other four years). So devide the days earth takes to circle around the sun by the rotation time and you’ll have the 24 hour days we’re used to.
However… The rotation speed of earth is slowly decreasing by 1,7 seconds every century. To compensate that difference leap seconds are used. The atomic clock is then changed by a second. Since few people care and even less people notice it, it’s not really something that newspapers fill their pages with.
So, now you know about the rotation speed of earth.