Definition:Length of Arc of Great Circle
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Definition
Let $E$ be a great circle on a sphere $S$ whose center is $O$.
Let $AB$ be an arc of $E$.
The length of $AB$ is defined as the angle subtended at $O$ by $AB$.
Sources
- 1976: W.M. Smart: Textbook on Spherical Astronomy (6th ed.) ... (previous) ... (next): Chapter $\text I$. Spherical Trigonometry: $2$. The spherical triangle.