this post was submitted on 24 Sep 2025
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Imperial Wastes So Much Time (infosec.pub)
submitted 1 day ago by Sunshine@piefed.ca to c/buyeuropean@feddit.uk
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[โ€“] NaibofTabr 4 points 18 hours ago* (last edited 18 hours ago) (1 children)

Hmm, I wonder... our current standard of time might end up being the standard for a long time, primarily because of GPS. Before we had global data networks it wasn't really possible to syncronize clocks all around the world. There used to be a telephone service that you could dial which would tell you "The time is now eight fifty-five PM" or w/e because that was the most effective way to distribute a coordinated time signal, and then you could manually set your local clock/watch to match.

But GPS depends heavily on accurate time information, and keeping it accurate is very complicated. Relativitistic time dilation applies because the satellites are:

  1. far enough away from Earth (~20000km) that they experience different gravity than devices on Earth's surface, causing local time for the satellite to be be faster, and
  2. moving so fast in their orbit that they experience a measurable slowing of local time.

(that's right, using GPS on your phone is a real-world demonstration of the theory of relativity in practical effect)

..and all those satellites are constantly checking in with each other and ground stations to make sure they're in agreement.

As a result there is now a de facto standard time reference for the entire world, and all networked devices depend on it for their own timing, and it is accurate to microseconds at worst.

100 years ago people were still winding mechanical clocks every day, and setting them by the local churchbell.

[โ€“] Hamartiogonic@sopuli.xyz 4 points 18 hours ago* (last edited 18 hours ago) (1 children)

Yep. This stuff is surprisingly complicated, and thatโ€™s why we need to measure the day using a standardized unit instead of defining the unit with the day.

Incidentally, Wikipedia has a nice graph about the variation of the length of day. Itโ€™s surprisingly messy and pretty far from the ideals of antiquity.

[โ€“] MonkderVierte@lemmy.zip 2 points 12 hours ago

Planck second is constant.