(astronomy) The fundamental unit of time of the International System of Units from 1960 until 1968, equal to 1/31556925.9747 of the tropical year defined by the mean motion of the sun in longitude at the epoch 1900 January 0 day 12 hours.
ephemeris second
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 | Dynamical Time (astronomy) |
| second (length, time, geometry, astronomy, music, other) |
| day (time) |
 | What is an ephemeris? Read answer... |
| Is there an ephemeris for wormholes? Read answer... |
| Where can you find online an ephemeris of wormholes? Read answer... |
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Related answers
- What is an ephemeris?
- Is there an ephemeris for wormholes?
- Where can you find online an ephemeris of wormholes?
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Mentioned in
- Dynamical Time (astronomy)
- second (length, time, geometry, astronomy, music, other)
- day (time)
- Gaussian gravitational constant
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