| 1. | There also is Ephemeris time, which may include overlapping information.
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| 2. | D Brouwer suggested the name'ephemeris time '.
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| 3. | The length of second so defined was practically equal to the second of ephemeris time.
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| 4. | In view of the fluctuation term, practical determination of the difference between ephemeris time and UT depended on observation.
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| 5. | When ephemeris time was first adopted, time scales were still based on astronomical observation, as they always had been.
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| 6. | Clemence's formula, now superseded by more modern estimations, was included in the original conference decision on ephemeris time.
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| 7. | In this way, decisions made by the original designers of ephemeris time influenced the length of today's mean solar time.
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| 8. | The difference between Terrestrial Time ( TT ) ( the successor to ephemeris time ) and atomic time was later defined as follows:
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| 9. | He developed the ephemeris time scale, which had been adopted by the Hz, was used to define the second internationally since 1967.
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| 10. | A detailed proposal of this kind was published in 1948 and adopted by the IAU in 1952 ( see Ephemeris time-history ).
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