When Is Earth Closest To The Sun Online

| Event | Date (approx) | Distance from Sun | Orbital speed | Solar intensity | |-------|---------------|------------------|---------------|------------------| | Perihelion | Jan 3–5 | 147.1 million km | 30.3 km/s | +7% vs average | | Aphelion | Jul 4–6 | 152.1 million km | 29.3 km/s | −7% vs average |

If you’d like to calculate the exact time of perihelion for a specific year (including 2026), I can provide the formula or look it up in NASA’s Horizons ephemeris. Just ask.

False. If you drew Earth’s orbit on a sheet of paper, you would struggle to tell it apart from a circle. It’s only 1.67% away from perfectly circular. Many other planets (like Mercury and Mars) have much more elliptical orbits.

This is the million-dollar question. If we’re closer to the Sun in January, why is the Northern Hemisphere freezing?

The answer is axial tilt, not distance.

Earth is tilted on its axis by about 23.5 degrees. During January, the Northern Hemisphere is tilted away from the Sun. This means sunlight hits at a lower, more glancing angle, spreading the same amount of energy over a larger area and taking a longer path through the atmosphere. Days are also shorter, giving less time for the ground to warm.

Conversely, in July—when we’re farthest from the Sun—the Northern Hemisphere is tilted toward the Sun. The sunlight arrives more directly (higher angle), creating the intense, concentrated heat we call summer.

In short: Distance drives the seasons for the planet as a whole, but tilt drives the seasons for each hemisphere.

To understand why Earth has a closest point, you must first understand that Earth’s orbit is not a perfect circle. when is earth closest to the sun

Earth’s orbit is an ellipse with a very low eccentricity (about 0.0167). That means it’s nearly circular, but not perfectly so. As a result, the sun is not at the exact center of this ellipse; it sits at one of the two focal points.

Consequently, every planet has two key points in its orbit:

For Earth:

The difference? About 3 million miles (or 5 million kilometers). That sounds enormous, but in cosmic terms, it’s only a 3.3% difference in distance. | Event | Date (approx) | Distance from

For our friends in Australia, South Africa, and South America, early January is the middle of summer. This aligns perfectly with their intuition. When the Southern Hemisphere is tilted toward the sun (December to February), they receive direct sunlight and experience summer. The fact that Earth is also at perihelion (closest to the sun) during their summer amplifies their summers slightly.

Meanwhile, during their winter (July), Earth is at aphelion (farthest from the sun), making their winters slightly cooler than they would otherwise be.

Humanity has noticed the sun’s changing behavior for millennia, even without understanding elliptical orbits.