Empirical Earth · The Sky — Sun, Moon & Stars

Twilight comes in three measured shades — only a globe explains them

The claim

“Sunset is just the Sun receding and dimming — that explains the dark sky.”

What is measured

Civil, nautical and astronomical twilight are defined by the Sun being 6°, 12° and 18° below the horizon. A receding flat-earth spotlight is always above the plane and can never be any degrees below a horizon, so the entire three-stage framework, and its exact latitude-and-season timings, is a globe signature.

What would show this is wrong

twilight that fails to deepen in three stages tied to the Sun’s depression below the horizon; a Sun measured 18° below the horizon over a flat plane; or twilight durations that ignore latitude and season.

Sources

  1. Twilight defined in degrees below the horizon. Civil, nautical and astronomical twilight are the Sun’s center at 6°, 12° and 18° below the horizon (zenith distances 96°, 102°, 108°); nautica link
  2. Twilight duration, latitude & white nights. All three stages pass in ~70 minutes at the equator but stretch for hours at high latitude; near 60° in summer civil twilight can last all night ( link
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