If you are asked “How long is the day?” and you answer “24 hours”, we are gonna tell you that you’re wrong.
The Earth rotates around 365 times a day. However, it wasn’t always so. Around 444 million years ago, the Earth rotated around 420 times a day and few million years back, it dropped down to 410.
Factors like sea levels and shifts within the earth affects the rotation. However, the biggest factor is the Moon going away from the Earth which in turn slows the Earth’s rotation.
The record for the shortest day was set in 2005. In 2020, the record has been broken 28 times and the average amount of day in the year was 0.5 milliseconds while on average, days are generally longer.
The senior research scientist with National Physical Laboratory’s time and frequency group, Peter Whibberley said to the Telegraph, “It is certainly correct that the Earth is spinning faster now than at any time in the last 50 years”. He added that it might require the concept of leap second system to be removed.
The average day will be shorter by 0.05 seconds this year. This won’t be affecting human life in general but will affect the satellite communication that rely on the solar time aligning with Universal Coordinated Time (UTC) and the computer systems that aren’t prepared for the change.