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A comment on The Meter, Golden Ratio, Pyramids, and Cubits, Oh My. Parent comment

Re:The Meter, Golden Ratio, Pyramids, and Cubits, Oh My by troymc on Tuesday March 04, 2025 @09:08AM (#43254774)
One use case is to estimate the minimum latency for communications between two points on opposite sides of the Earth, which would be how long it takes light to travel halfway around the Earth:

= 20,000 km / (speed of light)

~= 66.7 milliseconds

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Re:The Meter, Golden Ratio, Pyramids, and Cubits, Oh My by whatshisface on Tuesday March 04, 2025 @11:49AM (#43257143)
Not quite the minimum. :-)

Beams of neutrinos can be sent through the Earth and detected on the other side.

https://www.livescience.com/19075-neutrino-particle-communic...

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Re:The Meter, Golden Ratio, Pyramids, and Cubits, Oh My by troymc on Tuesday March 04, 2025 @05:11PM (#43260339)
This is true. Using a neutrino beam, the minimum latency would be approximately:

(diameter of Earth) / (speed of light) ~= 42.5 milliseconds

Some high-frequency traders might actually be able to justify the investment needed to enable such low-latency communications!

Come to think of it, you could also use gravitational waves...

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