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  • Category: General

    Is earth's rotation slowing down?

    Recently I was going through an article which says that earth's rotation is slowing down slightly with the time which means the days were short in the past. This is due to the tidal effects the Moon has on Earth's rotation. Atomic clocks show that a modern day is longer by about 1.7 milliseconds than a century ago, slowly increasing the rate at which UTC is adjusted by leap seconds.

    How will it effect if further slows down and make days further long?
  • #666818
    I also read something about this. It was stated that earth is becoming slow by .002 second per century. This is the information given in the article. This is happening because of the friction between the solid earth and ocean tides, the article says. The rotational energy last by the earth will go to the Moon. So the moon may become fast or may get a bigger orbit of rotation. So the duration between two consecutive full moon days may increase and which can be understood the other way that day duration will increase. But these changes are very small and take a lot of time and no human being may experience these changes and we will not have any effect on the atmosphere.
    drrao
    always confident

  • #666819
    The time is changing, maybe the earth is unable to bear our torture every day and slowing down its speed of rotation. Though the rate at which it is slowing down is not at all significant at this moment. If this rate increases suddenly, then it is going to be a concern. There may be some imbalances in the lifestyle of the species if the duration of the day increases which is going to have a cumulative effect on everything. Human beings will be affected too in that case, but I am sure scientists are keeping a close watch on the activities and will issue the necessary warnings accordingly.
    Sankalan

    "Life is easier when you enjoy what you do"

  • #666930
    I also heard about the slowing of rotational speed. It is very interesting to study its affects. Actually, Moon's gravitational pull attracts great masses of water towards it while in orbit around us. When Earth turns eastward the tides move westward. This phenomenon slows the rotation of Earth by 0 .0016 seconds per century. We know that the Devonian year was 400 days making each day 22 hours. Nothing is constant in our planet; continents move, even length of the day also changes. In a binary system like Earth and Moon, if one of the two companions loses momentum, the other one must gain momentum. Over time, as the Earth rotation slows, orbital velocity of the Moon increases forcing it to gradually recede from us. Slowing of Earth rotation affect the gravitation forces and this may cause frequent Earthquakes.

  • #666932
    This slowing down is so small that it will take thousands of years for an appreciable change in day and night time. I feel this will be a type of long term evolution and may have some effects on the flora and fauna which cannot be understood at the present time.
    Thoughts exchanged is knowledge gained.

  • #666944
    There are some cosmic phenomenons which are happening with the celestial bodies and they are of a long time nature. Some examples are ending the life of a star from a present bright burning body to red giant and finally to a white dwarf. The galaxies are receding from each other in that vast space of universe which is explained by the theory of enlarging of universe called expanding universe. So, energies are changing from one form to other but the gravitational pull of bodies is keeping the planets bound to their respective suns (stars) which in turn are bounded in their cluster of stars or the galaxy to which they belong. Each galaxy is moving along with its residents. These are very long time changes and stand as small variations if seen from the prospect of the size and age of the universe. Though science has not understood the exact reasons of these slow changes bringing changes in the universe itself but these are the observations which will help the astronomers to understand and unravel the mysteries of the universe about which very less is known today. The rotation time of earth is one such observation and is related to change of energy from one form to another.
    Knowledge is power.

  • #667506
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  • #667508
    I read in forbes :
    Earth's rotation, as with many things, is cyclical, slowing down by a few milliseconds per day then speeding up again. We will never notice this very slight variation in the rotational speed of Earth. However, we will certainly notice the result, an increase in the number of severe earthquakes. Scientists believe a slowdown of the Earth's rotation is the link to an observed cyclical increase in earthquakes.

    While scientists aren't exactly sure about the mechanisms that produce this variation, there are a few hypotheses.

    One hypothesis involves Earth's outer core, a liquid metal layer of the planet that circulates underneath the solid lower mantle. The thought is that the outer core can at times "stick" to the mantle, causing a disruption in its flow. This would alter Earth's magnetic field and produce a temporary hiccup in Earth's rotation.

    Currently, the data only notes a striking correlation, but no causation. Hence, scientists are still unsure whether this change in Earth's rotation is the cause of an uptick in earthquakes.

    “Each day provides its own gifts.” —Marcus Aurelius


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