Aphelion Day 2023: What causes summer heat even though Earth is farthest from the Sun?

Aphelion Day 2023 is an astronomical event marking the furthest point of Earth and the other planets from the Sun in their elliptical orbits and will be observed this week. This celestial phenomenon occurs every year in July when our planet reaches its maximum distance from the sun.

Aphelion Day is a fascinating reminder of the intricate dance between the Earth and the Sun, embodying the forces that shape the seasons and influence our climate. It provides an opportunity for scientists, astronomy enthusiasts and curious individuals to delve deeper into the mysteries of our vast solar system.

This is a good day to learn what aphelion means: Today, Earth is at the furthest point from the Sun in our orbit.https://t.co/AVCDrMWowa https://t.co /gSN8iPUMRK

– NASA Earth (@NASAEarth)
July 4, 2020

During aphelion, the Earth is about 152 million kilometers (94.5 million miles) from the Sun, about 5 million kilometers (3 million miles) farther than during perihelion, the point of closest approach. This means our planet is experiencing a slightly reduced amount of solar radiation compared to other times of the year.

The reason behind the Earth’s elliptical orbit and its changing distance from the Sun lies in the gravitational interaction between the two celestial bodies. Johannes Kepler, the famous German astronomer, described this phenomenon in his laws of planetary motion in the 17th century.

Aphelion Day 2023

Kepler’s Law states that “The planets move around the Sun in elliptical orbits, with the Sun located at one of the foci of the ellipse.” As a result, the distance between the Earth and the Sun fluctuates throughout the year, leading to the occurrence of Aphelion Day.

Astronomy enthusiasts and scientists often mark the occasion by organizing stargazing events, where people gather to observe the night sky and learn more about Earth’s place in the universe. pillar. These gatherings provide opportunities to spark curiosity, inspire the next generation of scientists, and advance our understanding of the universe we inhabit.

Venus and Mars will be visible to the naked eye about an hour after sunset. Observers in the western sky will notice Venus shining brightly, like a brilliant white star. On the other hand, Mars will appear as a smaller red star.

Why is it still so hot?

The impact of aphelion on our planet is not limited to astronomical curiosity. The change in distance affects Earth’s climate, albeit in a subtle way. Because the amount of solar energy reaching the planet is slightly reduced during aphelion, it has a negligible cooling effect. However, this effect is overshadowed by other factors, such as the tilt of the Earth’s axis, which is the main cause of our seasons.

The main factor determining the changes in seasons and temperatures on Earth is not the distance from the Sun but the tilt of the Earth’s axis. This axial tilt, about 23.5 degrees, causes different parts of the planet to receive different amounts of sunlight throughout the year.

Aphelion Day 2023

During Aphelion Day, the Northern Hemisphere tilts towards the Sun, resulting in summer in that area. The tilt allows sunlight to hit the surface directly, leading to increased solar radiation and higher temperatures. So even though the Earth is furthest from the Sun during this time, the tilt of its axis compensates for the loss of solar energy, resulting in warm weather.

It is important to note that the influence of the Earth’s elliptical orbit and aphelion on temperature is relatively small compared to the effect of axial tilt. Axial tilt is the primary cause of the seasons, while changes in Earth’s distance from the Sun have a secondary influence.

Other factors, such as local geography, ocean currents, and atmospheric conditions, also play an important role in determining the weather on Aphelion Day. For example, proximity to large bodies of water, mountain ranges, or prevailing wind patterns can affect heat distribution and alter local temperatures.

Categories: Optical Illusion
Source: pagasa.edu.vn

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