On Mon, 2021-04-26 at 23:57 +0100, Tony Finch wrote:
John Sauter via tz <tz@iana.org> wrote:
Based on the way the Earth has been rotating recently, the next leap second will be around the end of this decade, and it will be a negative leap second.
Yikes! I have re-calculated the "PREDICTIONS" formulae from the latest Bulletin A and I get the numbers below (which agree with your statement).
https://datacenter.iers.org/data/latestVersion/6_BULLETIN_A_V2013_016.txt
2022-01-01 MJD 59580 UT1-UTC -0.077349 +/- 0.015906 2023-01-01 MJD 59945 UT1-UTC +0.017592 +/- 0.031025 2024-01-01 MJD 60310 UT1-UTC +0.112533 +/- 0.043922 2025-01-01 MJD 60676 UT1-UTC +0.207565 +/- 0.055679 2026-01-01 MJD 61041 UT1-UTC +0.302505 +/- 0.066625 2027-01-01 MJD 61406 UT1-UTC +0.397446 +/- 0.076999 2028-01-01 MJD 61771 UT1-UTC +0.492388 +/- 0.086926 2029-01-01 MJD 62137 UT1-UTC +0.587419 +/- 0.096513 2030-01-01 MJD 62502 UT1-UTC +0.682360 +/- 0.105767
Tony.
As a prelude to the negative leap second, I expect the IERS to issue a Bulletin D around the beginning of July this year to increase DUT1 from -0.2 to -0.1. This will be the first increase in DUT1 not caused by a leap second. John Sauter (John_Sauter@systemeyescomputerstore.com) -- get my PGP public key with gpg --locate-external-keys John_Sauter@systemeyescomputerstore.com