Earth’s rotation slows down and could lead to 25-hour days in 200 million years

The day at Terra could last 25 hours in the very distant future. The planet’s rotation has gradually slowed down for billions of years. Essa change occurs mainly due to the gravitational influence of Lua. Estudos scientists estimate that the 25-hour day should arrive in about 200 million years, maintaining the current rate of braking. The variation occurs on a scale of milliseconds per century and does not affect everyday life.

Scientists track these oscillations precisely using instruments such as ring lasers. The process of lengthening the day is imperceptible in everyday life. Especialistas state that there is no reason to adjust clocks or calendars because of this long-term trend.

Main causes of slowdown in rotation

The tidal force exerted by Lua on the oceans of Terra generates friction that transfers angular momentum from the planet to the natural satellite. Como result, Lua slowly moves away from Terra, while the earth’s rotation loses speed. Outros The planet’s internal factors, such as the movement of the liquid core and plate tectonics, also contribute to small variations in spin.

In the distant past, the Earth day lasted less than 24 hours. Há about 1.4 billion years, for example, a complete rotation occurred in around 18 hours and 41 minutes. Over time, the day lengthened until it reached the current 24 hours.

• Gravitational interaction with Lua is the main braking mechanism
• Lunar separation occurs on the order of a few centimeters per year
• Internal processes of the Terra generate additional rotation oscillations
• Recent climate changes influence day length in milliseconds per century

Current variations and precise measurements

The exact length of a day is not fixed at 86,400 seconds. Pequenas fluctuations occur for different reasons, including mass redistribution caused by melting glaciers and global warming. Recent Pesquisas data indicate that the current lengthening of the day reaches about 1.33 milliseconds per century due to these effects.

Observatories use advanced technologies to record these changes. Over short periods, such as two weeks, the rotation can vary by up to six milliseconds. Esses Data helps calibrate systems like GPS, which rely on high temporal precision.

Experts from Observatório Nacional and international institutions reinforce that variations remain minimal. Não There is a need for practical changes in the time standards used by society.

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Projections for the distant future

The estimate of a 25-hour day is based on the continued slowdown observed throughout geological history. In 200 million years, according to models based on the current rate, the planet should complete one rotation in 25 hours. Esse The term is so long that it surpasses any known human or civilizational scale.

Scientists warn that long-term projections involve uncertainty. Fatores How changes in the lunar orbit or geological events can alter the exact rhythm. Ainda Thus, the general trend of day lengthening remains consistent in paleontological and astronomical records.

Scientific and technological impacts

Satellite navigation and communication systems already take into account variations in the Earth’s rotation. Adjustments are routinely made by intercalary seconds when necessary. In the distant future, a longer day could theoretically affect biological rhythms, but this possibility is beyond any foreseeable horizon for humanity.

Research continues to monitor the phenomenon with high-precision equipment. The current focus lies on better understanding the contributions of each factor, including the role of climate in the redistribution of planetary mass.

What historical data reveals

Records of ancient eclipses and fossil analyzes allow us to reconstruct the evolution of day length. Há billion years ago, the day was significantly shorter. The transition to 24 hours occurred progressively, driven mainly by the Terra-Moon dynamics.

Studies by Universidade Técnica, Munique and other institutions confirm the secular slowdown. Eles use laser measurements and computer models to validate the projections. Science treats the topic as a natural process of terrestrial geodynamics, with no immediate implications for everyday life.