Decade progress ▓▓▓▓▓▓▓▓▓▓▓▓▓▓░ 99%
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Leap seconds are only announced six months in advance. We don't know how long the 2020s are going to be
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Specifically, leap seconds (or lack thereof) are announced in IERS Bulletin C, which is charmingly addressed "To authorities responsible for the measurement and distribution of time"pic.twitter.com/Qn7FoJbLSX
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"Authorities" is metrology jargon for USNO and NIST in the US, PTB in Germany, NPL in the UK, NICT in Japan, and every other national agency which has been made responsible for defining legal time in that country.
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