The Motion of Earth Around Sun

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The Motion of Earth Around the Sun: A Scientific Perspective

By Shahid Ullah Khan, Lecturer – PGC D9 Campus, Rawalpindi

Science has long established that Earth revolves around the Sun at an astonishing speed of approximately 107,000 km/h. This journey takes place along an elliptical orbit, not a perfect circle, with the average distance between Earth and the Sun being about 150 million kilometers.

The Orbit and Seasons

It takes 365.25 days for Earth to complete one full revolution around the Sun. This orbital motion is responsible for the changing seasons. At the same time, Earth is also rotating on its axis, completing one full spin in 23 hours, 56 minutes, and 4 seconds. This rotation causes the daily cycle of day and night.

One important feature of Earth's rotation is its tilted axis, which is inclined at 23.5 degrees. This tilt is a major factor in the variation of seasons, as it changes the angle and intensity of sunlight received in different parts of the world throughout the year.

Elliptical Orbit and Earth's Distance from the Sun

The Sun is not located at the center of Earth’s elliptical orbit; instead, it resides at one of the two foci of the ellipse. This means that Earth's distance from the Sun varies during the year.

  • Perihelion: This is the point where Earth is closest to the Sun, occurring around early January. At this time, the distance between the Earth and the Sun is about 147.1 million kilometers. Interestingly, this is also winter in the northern hemisphere. Despite being closer to the Sun, it feels cold because the Sun’s rays strike at a lower angle, and much of the energy passes above the atmosphere.

  • Aphelion: This is when Earth is farthest from the Sun, around early July, with a distance of about 152.1 million kilometers. Yet, this coincides with summer in the northern hemisphere. The reason it feels hotter is due to the direct angle of sunlight during this period, leading to greater energy absorption by the Earth's surface.

The Misconception

Despite overwhelming scientific evidence, some people—unfortunately even in Pakistan—still believe that Earth is stationary. It's important to rely on science and observable facts to understand our universe better.

May God guide us all toward truth and knowledge.

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