The science of measuring the sun's position, distance, or properties using specialized instruments.
From Greek helios (sun) + -metry (measurement). Combines ancient Greek roots with the scientific suffix -metry, which became common in the 16th century for naming measurement disciplines.
Heliometry was crucial for 18th-century astronomers trying to figure out distances in space—by measuring how the sun appeared to shift position from different points on Earth, they could calculate distances to stars. This principle, called parallax, is the same technique surveyors still use today!
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