Length of Day (LOD)
Jerry Brennan - March 9, 2004
|
Length of day (LOD) in excess of 86400 seconds (24 hours) from 1974
through 2003
This table lists mean annual estimates of the duration of the day in excess of 24 hours, and the estimated mean error of those estimates. The LOD and error numbers are in milliseconds. The numbers are derived from daily LOD data at: ftp://maia.usno.navy.mil/ser7/finals.all (which may have more data than you may want to examine) and may be considered for use to extend the LOD series in the table at: LOD since 1623 which has LOD estimates from 1623 through 1998 (as well as other data). Graphs of LOD from 1623 through 2003, and from 1860 through 2003 may be found at: lods1623.gif and lods1860.gif YEAR LOD Est Error 1974.5 2.72 0.22238 1975.5 2.69 0.25030 1976.5 2.91 0.29423 1977.5 2.77 0.28338 1978.5 2.88 0.31803 1979.5 2.61 0.28971 1980.5 2.30 0.17200 1981.5 2.15 0.19824 1982.5 2.16 0.19122 1983.5 2.28 0.13008 1984.5 1.51 0.04963 1985.5 1.45 0.03791 1986.5 1.24 0.03817 1987.5 1.36 0.03705 1988.5 1.31 0.03138 1989.5 1.52 0.02249 1990.5 1.95 0.01832 1991.5 2.04 0.01361 1992.5 2.22 0.01112 1993.5 2.36 0.00896 1994.5 2.19 0.00708 1995.5 2.31 0.00794 1996.5 1.82 0.00735 1997.5 1.84 0.00630 1998.5 1.37 0.00656 1999.5 0.99 0.00837 2000.5 0.72 0.00876 2001.5 0.57 0.00521 2002.5 0.48 0.00355 2003.5 0.27 0.00315 |
