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| abstraction > mathematical concept > unit > time unit > second unit > ephemeris second |
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| ephemeris second comparison table | ||||
| Subject | is an instance of | is a kind of | has value | has definition |
|---|---|---|---|---|
| second unit | time unit | |||
| ephemeris second | second unit | 1/31556925.97474 tropical year | The length of a tropical second (1/31556925.97474 of the tropical year) on 1900 January 0.5 ephemeris time. |
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