Explanation
he position of a planet when it's nearest to the Sun is called perihelion. Here's some extra information about perihelion:
It comes from the Greek words "peri" (around) and "helion" (Sun).Earth's perihelion occurs around January 3rd of each year. At this point, we're about 147 million kilometers away from the Sun.Though Earth is closer to the Sun during perihelion, the difference in distance isn't enough to cause significant seasonal temperature variations. Seasonal temperatures are mainly caused by the tilt of Earth's axis on its orbital path.The opposite point in a planet's orbit, farthest from the Sun, is called aphelion. For Earth, aphelion happens around July 4th, and we're about 152 million kilometers from the Sun.
Our planet Earth journeys around the Sun in an elliptical orbit, meaning its path isn't a perfect circle. This creates two key points in its yearly trek: perihelion and aphelion.
Perihelion: Closest Encounter with the Sun
The term "perihelion" originates from the beautiful Greek words "peri" (around) and "helion" (Sun), literally translating to "around the Sun." It marks the moment when Earth reaches the closest point in its orbit to our star. This typically occurs around January 3rd of each year. At this point, we're roughly 147 million kilometers away from the Sun, a seemingly vast distance but significantly closer than our farthest point.
Does Perihelion Make Summer? Not Quite!
Intuitively, one might think that being closer to the Sun during perihelion would translate to scorching summers in the Northern Hemisphere (where January falls in winter). However, the difference in distance between perihelion and aphelion (Earth's farthest point from the Sun, occurring around July 4th) is only about 3% of the total orbital distance. This variation in distance isn't the primary driver of seasonal temperature changes.
The Real Culprit: Earth's Tilted Axis
The true maestro behind the seasons is the tilt of Earth's axis on its orbital path. This tilt is about 23.5 degrees relative to a plane perpendicular to its orbit. As Earth travels around the Sun, different parts of the planet are tilted more directly towards the Sun, receiving a more concentrated beam of sunlight and experiencing warmer temperatures. Conversely, other regions are tilted away, receiving less direct sunlight and experiencing cooler temperatures. This tilt is what creates the cycle of seasons – summer, autumn, winter, and spring – across different hemispheres throughout the year.
Aphelion: When Earth is Farthest from the Sun
The opposite point in Earth's orbit, farthest from the Sun, is called aphelion. As mentioned earlier, this typically occurs around July 4th. At aphelion, we're situated roughly 152 million kilometers away from the Sun. Interestingly, despite being farther away, the difference in solar radiation received during aphelion isn't substantial enough to create drastically cooler summers in the Northern Hemisphere. The Earth's atmosphere acts like a giant blanket, moderating the temperature variations throughout the year.
In conclusion, while Earth's position relative to the Sun (perihelion and aphelion) plays a role in the amount of solar radiation it receives, the tilt of Earth's axis is the primary factor governing the dramatic seasonal temperature changes we experience throughout the years
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