The Science in the Bible

Entry 71 · Section 7: War

Watchtowers and Sightlines

A watchman above Jezreel scans the surrounding country and reports an approaching company before it reaches the city.

Scripture: 2 Kgs 9:17; Isa 21:6–9

OpticsGeodesy

Curved-Earth sightline from an observer 38.4 ft (11.70 meters) above the ground: 7.58 mi (12.2 kilometers) to the geometric horizon, before terrain and atmospheric effects.
Curved-Earth sightline from an observer 38.4 ft (11.70 meters) above the ground: 7.58 mi (12.2 kilometers) to the geometric horizon, before terrain and atmospheric effects.

The question

How far does a 32.8-foot platform extend an ideal geometric horizon?

Why it matters

Height first clears nearby obstacles; target size, contrast, weather, terrain, and recognition then determine useful warning distance.

Suggest a correction or new direction
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