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cdot2yesterday at 5:52 PM2 repliesview on HN

Julian date is sometimes used to synchronize timing for encrypted radio systems. My understanding is that early radio systems adapted it because it was used by astronomers. Astronomers used it because it didn't skip any days which would cause issues tracking long term astronomical cycles.


Replies

Sharlinyesterday at 5:56 PM

> Astronomers used it

And still use, in fact!

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iberatoryesterday at 11:19 PM

Julian date works exactly like Unix epoch, but instead of starting in junary 1 1970 it starts something like 2500 years ago.

Super easy for astronomy as you don't need to handle timezones and other junk