Empirical Earth · The Sky — Sun, Moon & Stars

Why the equator is hottest

The claim

“If the axis is tilted 23°, why is the tilted-away equator the hottest place?”

What is true

Tilting a surface away from a light does reduce the heat it receives. The geometry in the claim is correct.

What is measured

Heating goes as the cosine of the Sun’s angle, not distance. The equator gets the most concentrated sunlight all year. The 23.4° tilt drives the seasons, not the equator’s heat.

What would show this is wrong

the hottest zone tracking the tilt direction rather than the sub-solar latitude, or insolation that ignores the cosine-of-angle law.

Sources

  1. NASA NSSDCA — Sun Fact Sheet. NASA Goddard Space Flight Center. nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html link
  2. World Geodetic System 1984 (WGS 84). NGA Standardization Document, defining ellipsoid parameters (a, f, b). National Geospatial-Intelligence Agency. WGS 84 link
  3. Effect of Sun angle on climate — insolation and the cosine law. Surface heating follows I = I₀·cosθ; the equator’s near-overhead Sun makes it hottest, while axial tilt drives seasons. Sun an link
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