LOD to UT1 Integral of LOD is UT1 (or visa-versa If average LOD is 2 ms, then 1 second difference between ut1 and atomic time develops in 500 days Leap second added to utc at those times 02/803 12540Lec04 UT1-UTC UTl-UTC(discontinuities are leap-seconds 0.40 1993.01994.01995.01996.01997.019980199902000.09 02/18/03 12.540 Lec 04 17 LOD to UT1 • Integral of LOD is UT1 (or visa-versa) • If average LOD is 2 ms, then 1 second difference between UT1 and atomic time develops in 500 days • Leap second added to UTC at those times. 02/18/03 12.540 Lec 04 18 UT1-UTC -0.60 -0.40 -0.20 0.00 0.20 0.40 0.60 0.80 1993.0 1994.0 1995.0 1996.0 1997.0 1998.0 1999.0 2000.0 2001.0 UT1-UTC (discontinuities are leap-seconds) UT1-UTC (s) UT1-UTC (s) Year