Astrolabe rete and fitness tracker: what they have in common

1. Step 1. Astrolabe rete — is part of — Astrolabe. An openwork star map.
2. Step 2. Astrolabe — evolved into — Quadrant. A simplified angle gauge.
3. Step 3. Quadrant — uses — Universal gravitation. The angle is read against a plumb line.
4. Step 4. Universal gravitation — is a kind of — Newton’s laws. Part of Newtonian mechanics.
5. Step 5. Newton’s laws — is used in — Accelerometer. The sensor measures the force of inertia.
6. Step 6. Accelerometer — is part of — Fitness tracker. A pedometer.

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