Table 4.
Statistics of timescales of observational data extracted from the sources.
| Timescale | ts | N | N% | Ng | Ng% | Years |
|---|---|---|---|---|---|---|
| Central S.T. | CST | 1928 | 7.71% | 712 | 18.32% | 1897–1922 |
| Ephemeris Time | ET | 76 | 0.30% | 38 | 0.98% | 1949–1982 |
| Greenwich M.T. | GMT | 1480 | 5.92% | 488 | 12.56% | 1847–1923 |
| Local M.T. | LMT | 1201 | 4.80% | 480 | 12.35% | 1847–1920 |
| Paris M.T. | PMT | 444 | 1.78% | 144 | 3.71% | 1883–1912 |
| Pacific S.T. | PST | 619 | 2.48% | 118 | 3.04% | 1892–1905 |
| Terrestrial D.T. | TDT | 12 | 0.05% | 4 | 0.10% | 1984–1985 |
| U.T. | UT | 226 | 0.90% | 99 | 2.55% | 1928–1970 |
| Coordinated U.T. | UTC | 19010 | 76.05% | 1803 | 46.40% | 1963–2019 |
Notes. ts is the item for timescale defined in OCNS2019. Here, S.T., M.T., U.T., and D.T. are Standard Time, Mean Time, Universal Time, and Dynamic Time, respectively. N and N% are the number and percentage of observed coordinates, respectively, and Ng and Ng% are those of observation nights.
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