The exact date of perihelion is not perfectly fixed on the calendar. While it consistently falls in January, the precise day fluctuates between January 2 and January 5 from year to year.
The Earth is closest to the Sun in the month of . This specific point in Earth's elliptical orbit is known as perihelion . Although the exact date can shift slightly each year due to variations in the calendar and gravitational influences from other planets, it typically occurs between January 2nd and January 5th . Quick Facts About Perihelion Why Earth is Closest to Sun in Dead of Winter | Space
While Earth's orbit is nearly circular today, it slowly changes over thousands of years. The eccentricity can vary from nearly 0% to about 6% in a roughly 100,000-year cycle . These cycles, combined with axial tilt and precession (a wobble in Earth's rotation axis), form the Milankovitch cycles , which are believed to be major drivers of Earth's long-term climate, including the advance and retreat of ice ages.
The answer lies in the cause of our seasons. Planetary seasons are entirely driven by the , not its distance from the Sun. The Tilt of the Axis during which month is the earth closest to the sun link
Earth reaches its closest point to the Sun (perihelion) during the first week of , usually around January 2nd or 3rd. At this precise moment, Earth is approximately 147 million kilometers ( million miles) away from the Sun.
The difference in distance between perihelion and aphelion (the farthest point from the Sun) does not have a significant impact on the Earth's climate. The main reason for this is that the amount of solar energy the Earth receives is influenced more by the tilt of its axis (which determines the angle of the Sun's rays) than by its distance from the Sun.
Roughly 91.4 million miles (147 million kilometers). The exact date of perihelion is not perfectly
Conversely, the Southern Hemisphere is tilted toward the Sun in January. This alignment brings them their summer season. The extra solar radiation from perihelion actually makes Southern Hemisphere summers slightly warmer than Northern Hemisphere summers, though the effect is largely moderated by the vast southern oceans. How Perihelion Impacts Earth's Speed
Instead, seasons are dictated by the of the Earth's axis.
Many people assume the Earth circles the Sun in a perfect ring. In reality, planetary orbits are oval-shaped, or elliptical. This planetary mechanic was first discovered by astronomer Johannes Kepler. Because the orbit is a slightly squashed circle, the distance between the Earth and the Sun changes continuously throughout our 365-day journey. The Orbital Extremes This specific point in Earth's elliptical orbit is
Because our orbit is nearly circular, the variation in distance between our closest approach () and our farthest approach ( aphelion ) is only about 3%.
By understanding the Earth's orbit and its variations, we can better appreciate the complexities of our climate and the many factors that shape our planet.
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While it doesn’t flip the seasons, being closer to the sun does have measurable effects: