Now the day is not 24 hours !

 New discovery..
 Our day will not have 24 hours...because the inner core of the Earth has changed its axis of rotation

Why 24 hours?

Let's attempt to comprehend this in steps. The idea of a 24-hour day originated with the ancient Egyptians. They used tools like shadow clocks to divide the day into 10 equal hours, and they then added an hour at each end (one for twilight and one at the end of the day). Egyptians later created a T-shaped bar that was calibrated to divide the period between sunrise and dusk into 12 segments.

However, it was challenging to split the nighttime hours because there was no light. Learning how they accomplished this is quite fascinating. Yes, the divide of time during the night was based on stargazing! Instead, they selected 36 star groups (small constellations) known as "decans," which rose successively on the horizon as the earth spun in those ancient times because they had access to modern technology. Each decan began its ten-day term by rising before sunrise. This resulted in a total of 36 decans and 36*10=360 days in a year. There were 18 of these decans that were visible from twilight to twilight. However, three of these decans were allotted to each twilight phase, leaving 12 for the period of total darkness (the duodecimal system)

The hours did not have a set length back then, though. The Greek astronomers who were looking for answers to questions about the universe, existence, stars, and galaxies (or, simply, astronomers) during the time found it challenging to manage computations using the standard approach. Then, Hipparchus proposed that a day be divided into 24 equal hours, giving rise to the "Equinoctial hours." Ordinary people continued to use the seasonally fluctuating hours even then for a considerable amount of time. Commoners didn't start utilizing the method we use now until the 14th century in Europe, when mechanical clocks were introduced.

But this will change when Chinese researchers confirmed that the Earth's inner core changed its rotation axis, and the researchers indicated that this would shorten the length of days by a small part of a second throughout the year and would also contribute to a slight effect on the Earth's magnetic field.