diff options
Diffstat (limited to 'timezone/leapseconds')
| -rw-r--r-- | timezone/leapseconds | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/timezone/leapseconds b/timezone/leapseconds index 1cd114b..82a8ddf 100644 --- a/timezone/leapseconds +++ b/timezone/leapseconds @@ -1,9 +1,10 @@ -# @(#)leapseconds 7.11 +# @(#)leapseconds 7.12 # Allowance for leapseconds added to each timezone file. # The International Earth Rotation Service periodically uses leap seconds -# to keep UTC to within 0.9 s of TAI (atomic time); see +# to keep UTC to within 0.9 s of UT1 +# (which measures the true angular orientation of the earth in space); see # Terry J Quinn, The BIPM and the accurate measure of time, # Proc IEEE 79, 7 (July 1991), 894-905. # There were no leap seconds before 1972, because the official mechanism |