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There's not gonna be a proper answer that applies to everyone. For myself, riding BMX flatland, riding unicycles, carving wood, learning survival skills, keeping time..
… keeping time?
Check my username. I've been partly obsessed with keeping accurate track of time since I learned to read an analog clock at age 9.
By age 12, I started learning the exact times of the school bells. By age 15, I learned how to rebuild digital watches, and even replace the quartz crystal with a more accurate one.
By age 17 I was rebuilding mechanical self-winding wristwatches, and also learning to overclock computers.
Edit: For extra clarity, I also now know how to tune the firing order on an ICE engine, no matter how many cylinders. I also know how to time a VCR and tune a guitar.
I'm 42 years old now.
Sounds like you should pursue a career at NIST so your hobby can align with a profession. They're all about keeping track of time to extreme precision with atomic and optical clocks.
355/113
Close enough right?
Interesting hobby. Iirc Einstein had his breakthrough trying to sync timepieces.
Also, a 1 meter pendulum swings at a rate of once per second. Handy info to know if all the clocks shut down, like in a survivalist situation or natural disaster.
Ah yes, because in an Apocalypse I'm gonna have a 1 meter pendulum handy.
Anything one meter long swinging on a pivot is a 1 meter pendulum no?
It probably only costs like $10 to get a measured line professionally tattooed on your leg/thigh for reference.