 Circular speed

ID: circular-speed

Codex  0 Created 2026-09-28 Updated 2026-10-06

In a spherical potential, the circular speed satisfies

v_{c}^{2} (r) = r \frac{d Φ}{d r} = \frac{GM ( < r )}{r} .

It measures the gravitational field even when the system itself is not supported by circular motion.

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