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A tilted globe illuminated from one side to illustrate sunlight reaching Earth's hemispheres.
Science & Space

Are Earth's seasons mainly caused by its distance from the Sun?

Published

Verdict
False
Verification confidenceHigh

Explanation

No. Earth's seasons are mainly caused by its tilted axis, rather than changes in its distance from the Sun. As Earth moves around its orbit, each hemisphere takes turns leaning toward or away from the Sun.

NASA explains that Earth is closest to the Sun in January and farthest away in July, during Northern Hemisphere summer. The National Weather Service explains that the tilt changes the angle of incoming sunlight: more direct rays concentrate energy over a smaller surface area.

The hemispheres experience opposite seasons despite sharing essentially the same Earth–Sun distance. Earth's distance does change during the year, but that variation is not the main explanation for the seasonal cycle.

Key takeaway

Earth's tilt explains the opposite seasons in the Northern and Southern Hemispheres.

Evidence

Earth is farthest from the Sun during northern summer

NASA

Contradicts the claim

NASA identifies axial tilt as the cause of the seasons and explains that Earth is closest to the Sun in January and farthest away in July.

Based on: NASA

Axial tilt changes the concentration of sunlight

National Weather Service

Contradicts the claim

The National Weather Service explains that Earth's tilted axis causes the seasons by changing the angle at which sunlight reaches the surface.

Based on: National Weather Service

The hemispheres have opposite seasonal timing

NASA and National Weather Service

Provides context

Both sources describe summer in one hemisphere occurring while the other hemisphere experiences winter.

Based on: NASA

Sources

NASA

What Causes the Seasons?

National Weather Service

Why Do We Have Seasons?

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