Seasons and sky
Earth-Sun Distance Cycle
Direct answer
Earth-Sun Distance Cycle: The Earth-Sun Distance Cycle is the annual variation in separation produced by Earth's slightly elliptical orbit, from perihelion to aphelion and back.
The Earth-Sun Distance Cycle is the yearly change between Earth closest and farthest solar distances.
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At a glance
- Found in
- Seasons & Earth Almanac
- Related
- Axial Tilt, Season Length Asymmetry, Astronomical Season, Equinox
The Earth-Sun Distance Cycle is the yearly change between Earth closest and farthest solar distances.
A Sun-Earth orientation for seasonal, atmospheric, tidal, and terrestrial terms.
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The story behind Earth-Sun Distance Cycle
Kepler elliptical-orbit model replaced the older assumption that Earth-Sun distance remains fixed through uniform circular motion.
Why Earth-Sun Distance Cycle matters
Earth-Sun Distance Cycle modestly changes incoming solar energy and orbital speed while demonstrating that axial tilt, not distance, drives opposite hemispheric seasons.
Earth-Sun Distance Cycle in practice: an example
Earth is closest to the Sun in early January and farthest in early July even though the two hemispheres experience opposite seasons.
Where readings of Earth-Sun Distance Cycle go wrong
The usual misreading is to attribute a particular cold snap, heat wave, or personal event directly to the slow annual distance change.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: The Seasons and the Earth's Orbit - Official explanation of axial tilt, solstices, equinoxes, perihelion, aphelion, and seasonal sunlight.
- NOAA Tides and Currents Glossary - Operational definitions for tides, tidal currents, ranges, datums, bores, and amphidromic systems.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Last updated
- 2026-09-26
Compare distance with seasonal tilt
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Common questions
What is the Earth-Sun Distance Cycle?
The Earth-Sun Distance Cycle is the annual variation in separation produced by Earth's slightly elliptical orbit, from perihelion to aphelion and back.
What do people get wrong about the Earth-Sun Distance Cycle?
The usual misreading is to attribute a particular cold snap, heat wave, or personal event directly to the slow annual distance change.
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