Orbital motion and mechanical clock: what they have in common

1. Step 1. Orbital motion — uses — Universal gravitation. Gravity sets the orbit.
2. Step 2. Universal gravitation — is used in — Escapement. The pace of the clock is set by a falling weight.
3. Step 3. Escapement — is part of — Mechanical clock. The escapement releases energy in portions and sets the rhythm.

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