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 true

The Sun does dim and redden as it sets, and perspective does make distant things appear lower.

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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