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・International Atomic Time (TAI)
- SI second defined by frequency of hyperfine transition of cesium133
- Measured and counted with international network of atomic clocks
・Co-ordinated Universal Time (UTC)
- Our civil time (in winter)
- Based on SI second, with 86400s/day
- Kept synchronised with UT1 since 1972 by addition of leap seconds
- Leap seconds not added to TAI, so TAI-UTC is not constant
- Currently (Nov 2012) TAI - UTC = 35s
- Use of leap secs currently under discussion (inconvenient for astro)
・Co-ordinated Universal Time (UTC)
- Currently (Nov 2012) TAI - UTC = 35s
・Calendar is independent of time system, so state both, e.g.
- 2011 November 11 11:00:00.0 UTC
- 2011 November 11 11:00:34.0 TAI
- JD 2455876.958333 UTC
- JD 2455876.958727 TAI
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