Billiard pockets and GPS (satellite navigation): what they have in common

1. Step 1. Billiard pockets — is part of — Billiards. Mesh pockets.
2. Step 2. Billiards — uses — Newton’s laws. Collisions of balls.
3. Step 3. Newton’s laws — is used in — Tsiolkovsky rocket equation. It follows from the conservation of momentum.
4. Step 4. Tsiolkovsky rocket equation — is used in — Liquid-propellant rocket engine. Rocket design relies on Tsiolkovsky’s equation.
5. Step 5. Liquid-propellant rocket engine — is part of — Reusable rocket. Liquid-propellant engines.
6. Step 6. Reusable rocket — has part — GPS (satellite navigation). Navigation during landing.

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